42044640 has 96 divisors (see below), whose sum is σ = 144498816. Its totient is φ = 10191360.

The previous prime is 42044633. The next prime is 42044647. The reversal of 42044640 is 4644024.

It is an interprime number because it is at equal distance from previous prime (42044633) and next prime (42044647).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 42044640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42044647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1299 + ... + 9261.

It is an arithmetic number, because the mean of its divisors is an integer number (1505196).

Almost surely, 2^42044640 is an apocalyptic number.

42044640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42044640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72249408).

42044640 is an abundant number, since it is smaller than the sum of its proper divisors (102454176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42044640 is a wasteful number, since it uses less digits than its factorization.

42044640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7992 (or 7984 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 42044640 is about 6484.1838345315. The cubic root of 42044640 is about 347.7257715421.

Adding to 42044640 its reverse (4644024), we get a palindrome (46688664).

The spelling of 42044640 in words is "forty-two million, forty-four thousand, six hundred forty".