40024640 has 112 divisors (see below), whose sum is σ = 104241600. Its totient is φ = 14579712.

The previous prime is 40024637. The next prime is 40024657. The reversal of 40024640 is 4642004.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176207 + ... + 176433.

Almost surely, 2^40024640 is an apocalyptic number.

40024640 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 40024640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52120800).

40024640 is an abundant number, since it is smaller than the sum of its proper divisors (64216960).

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

40024640 is a wasteful number, since it uses less digits than its factorization.

40024640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 282 counting only the distinct ones).

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

The square root of 40024640 is about 6326.5029834815. The cubic root of 40024640 is about 342.0653979334.

Adding to 40024640 its reverse (4642004), we get a palindrome (44666644).

The spelling of 40024640 in words is "forty million, twenty-four thousand, six hundred forty".