390503957 has 16 divisors (see below), whose sum is σ = 425768112. Its totient is φ = 356659200.

The previous prime is 390503951. The next prime is 390503987. The reversal of 390503957 is 759305093.

It can be written as a sum of positive squares in 8 ways, for example, as 224970001 + 165533956 = 14999^2 + 12866^2 .

It is a cyclic number.

It is not a de Polignac number, because 390503957 - 2²⁸ = 122068501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390503951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377513 + ... + 378545.

It is an arithmetic number, because the mean of its divisors is an integer number (26610507).

Almost surely, 2^390503957 is an apocalyptic number.

390503957 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

390503957 is a deficient number, since it is larger than the sum of its proper divisors (35264155).

390503957 is a wasteful number, since it uses less digits than its factorization.

390503957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688.

The product of its (nonzero) digits is 127575, while the sum is 41.

The square root of 390503957 is about 19761.1729661981. The cubic root of 390503957 is about 730.9289212854.

The spelling of 390503957 in words is "three hundred ninety million, five hundred three thousand, nine hundred fifty-seven".