40442240 has 64 divisors (see below), whose sum is σ = 100062000. Its totient is φ = 15611904.

The previous prime is 40442209. The next prime is 40442243. The reversal of 40442240 is 4224404.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40442243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17471 + ... + 19649.

Almost surely, 2^40442240 is an apocalyptic number.

40442240 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 40442240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50031000).

40442240 is an abundant number, since it is smaller than the sum of its proper divisors (59619760).

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

40442240 is a wasteful number, since it uses less digits than its factorization.

40442240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227 (or 2215 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 40442240 is about 6359.4213573249. The cubic root of 40442240 is about 343.2509390578.

Adding to 40442240 its reverse (4224404), we get a palindrome (44666644).

The spelling of 40442240 in words is "forty million, four hundred forty-two thousand, two hundred forty".