40721624 has 16 divisors (see below), whose sum is σ = 77429520. Its totient is φ = 20073760.

The previous prime is 40721621. The next prime is 40721627. The reversal of 40721624 is 42612704.

It is an interprime number because it is at equal distance from previous prime (40721621) and next prime (40721627).

It is a super-2 number, since 2×40721624² = 3316501322394752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40721593 and 40721602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40721621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35279 + ... + 36414.

It is an arithmetic number, because the mean of its divisors is an integer number (4839345).

Almost surely, 2^40721624 is an apocalyptic number.

It is an amenable number.

40721624 is a deficient number, since it is larger than the sum of its proper divisors (36707896).

40721624 is a wasteful number, since it uses less digits than its factorization.

40721624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71770 (or 71766 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 40721624 is about 6381.3497004944. The cubic root of 40721624 is about 344.0395438587.

The spelling of 40721624 in words is "forty million, seven hundred twenty-one thousand, six hundred twenty-four".