390993245 has 18 divisors (see below), whose sum is σ = 484241562. Its totient is φ = 303067296.

The previous prime is 390993233. The next prime is 390993257. The reversal of 390993245 is 542399093.

It is an interprime number because it is at equal distance from previous prime (390993233) and next prime (390993257).

It can be written as a sum of positive squares in 3 ways, for example, as 192155044 + 198838201 = 13862^2 + 14101^2 .

It is not a de Polignac number, because 390993245 - 2⁸ = 390992989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 390993196 and 390993205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1635836 + ... + 1636074.

It is an arithmetic number, because the mean of its divisors is an integer number (26902309).

Almost surely, 2^390993245 is an apocalyptic number.

It is an amenable number.

390993245 is a deficient number, since it is larger than the sum of its proper divisors (93248317).

390993245 is an frugal number, since it uses more digits than its factorization.

390993245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 390993245 is about 19773.5491250306. The cubic root of 390993245 is about 731.2340701232.

The spelling of 390993245 in words is "three hundred ninety million, nine hundred ninety-three thousand, two hundred forty-five".