390908929 has 2 divisors, whose sum is σ = 390908930. Its totient is φ = 390908928.

The previous prime is 390908927. The next prime is 390908953. The reversal of 390908929 is 929809093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223801600 + 167107329 = 14960^2 + 12927^2 .

It is an emirp because it is prime and its reverse (929809093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390908929 - 2¹ = 390908927 is a prime.

Together with 390908927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (390908927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195454464 + 195454465.

It is an arithmetic number, because the mean of its divisors is an integer number (195454465).

Almost surely, 2^390908929 is an apocalyptic number.

It is an amenable number.

390908929 is a deficient number, since it is larger than the sum of its proper divisors (1).

390908929 is an equidigital number, since it uses as much as digits as its factorization.

390908929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 390908929 is about 19771.4169699594. The cubic root of 390908929 is about 731.1815038576.

The spelling of 390908929 in words is "three hundred ninety million, nine hundred eight thousand, nine hundred twenty-nine".