404431939 has 2 divisors, whose sum is σ = 404431940. Its totient is φ = 404431938.

The previous prime is 404431927. The next prime is 404431949. The reversal of 404431939 is 939134404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404431939 - 2⁹ = 404431427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404431898 and 404431907.

It is not a weakly prime, because it can be changed into another prime (404431919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202215969 + 202215970.

It is an arithmetic number, because the mean of its divisors is an integer number (202215970).

Almost surely, 2^404431939 is an apocalyptic number.

404431939 is a deficient number, since it is larger than the sum of its proper divisors (1).

404431939 is an equidigital number, since it uses as much as digits as its factorization.

404431939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 404431939 is about 20110.4932560094. The cubic root of 404431939 is about 739.5175446665.

The spelling of 404431939 in words is "four hundred four million, four hundred thirty-one thousand, nine hundred thirty-nine".