39956404 has 24 divisors (see below), whose sum is σ = 71349320. Its totient is φ = 19574784.

The previous prime is 39956401. The next prime is 39956407. The reversal of 39956404 is 40465993.

It is an interprime number because it is at equal distance from previous prime (39956401) and next prime (39956407).

It can be written as a sum of positive squares in 4 ways, for example, as 291600 + 39664804 = 540^2 + 6298^2 .

It is a super-2 number, since 2×39956404² = 3193028441222432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39956401) 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, 56002 + ... + 56710.

Almost surely, 2^39956404 is an apocalyptic number.

It is an amenable number.

39956404 is a deficient number, since it is larger than the sum of its proper divisors (31392916).

39956404 is a wasteful number, since it uses less digits than its factorization.

39956404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 977 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 39956404 is about 6321.1078142996. The cubic root of 39956404 is about 341.8708973168.

The spelling of 39956404 in words is "thirty-nine million, nine hundred fifty-six thousand, four hundred four".