40064240 has 80 divisors (see below), whose sum is σ = 100038240. Its totient is φ = 14868480.

The previous prime is 40064239. The next prime is 40064249. The reversal of 40064240 is 4246004.

It is a tau number, because it is divible by the number of its divisors (80).

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 (40064249) 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, 120875 + ... + 121205.

It is an arithmetic number, because the mean of its divisors is an integer number (1250478).

Almost surely, 2^40064240 is an apocalyptic number.

40064240 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 40064240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50019120).

40064240 is an abundant number, since it is smaller than the sum of its proper divisors (59974000).

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

40064240 is a wasteful number, since it uses less digits than its factorization.

40064240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 40064240 is about 6329.6319008296. The cubic root of 40064240 is about 342.1781728378.

It can be divided in two parts, 40064 and 240, that added together give a palindrome (40304).

The spelling of 40064240 in words is "forty million, sixty-four thousand, two hundred forty".