404039939 has 2 divisors, whose sum is σ = 404039940. Its totient is φ = 404039938.

The previous prime is 404039929. The next prime is 404039983. The reversal of 404039939 is 939930404.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404039939 - 2¹² = 404035843 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 404039896 and 404039905.

It is not a weakly prime, because it can be changed into another prime (404039929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202019969 + 202019970.

It is an arithmetic number, because the mean of its divisors is an integer number (202019970).

Almost surely, 2^404039939 is an apocalyptic number.

404039939 is a deficient number, since it is larger than the sum of its proper divisors (1).

404039939 is an equidigital number, since it uses as much as digits as its factorization.

404039939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 404039939 is about 20100.7447374469. The cubic root of 404039939 is about 739.2785389897.

The spelling of 404039939 in words is "four hundred four million, thirty-nine thousand, nine hundred thirty-nine".