40004072 has 16 divisors (see below), whose sum is σ = 75322500. Its totient is φ = 19918080.

The previous prime is 40004057. The next prime is 40004087. The reversal of 40004072 is 27040004.

It is an interprime number because it is at equal distance from previous prime (40004057) and next prime (40004087).

It can be written as a sum of positive squares in 2 ways, for example, as 38763076 + 1240996 = 6226^2 + 1114^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40004072.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8447 + ... + 12302.

Almost surely, 2^40004072 is an apocalyptic number.

It is an amenable number.

40004072 is a deficient number, since it is larger than the sum of its proper divisors (35318428).

40004072 is a wasteful number, since it uses less digits than its factorization.

40004072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20996 (or 20992 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 40004072 is about 6324.8772320101. The cubic root of 40004072 is about 342.0067939783.

Adding to 40004072 its reverse (27040004), we get a palindrome (67044076).

The spelling of 40004072 in words is "forty million, four thousand, seventy-two".