390949057 has 2 divisors, whose sum is σ = 390949058. Its totient is φ = 390949056.

The previous prime is 390949049. The next prime is 390949079. The reversal of 390949057 is 750949093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385768881 + 5180176 = 19641^2 + 2276^2 .

It is an emirp because it is prime and its reverse (750949093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390949057 - 2³ = 390949049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 390948998 and 390949016.

It is not a weakly prime, because it can be changed into another prime (390946057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195474528 + 195474529.

It is an arithmetic number, because the mean of its divisors is an integer number (195474529).

Almost surely, 2^390949057 is an apocalyptic number.

It is an amenable number.

390949057 is a deficient number, since it is larger than the sum of its proper divisors (1).

390949057 is an equidigital number, since it uses as much as digits as its factorization.

390949057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 390949057 is about 19772.4317422011. The cubic root of 390949057 is about 731.2065223426.

The spelling of 390949057 in words is "three hundred ninety million, nine hundred forty-nine thousand, fifty-seven".