390139245 has 24 divisors (see below), whose sum is σ = 690633216. Its totient is φ = 203646048.

The previous prime is 390139241. The next prime is 390139261. The reversal of 390139245 is 542931093.

It is a happy number.

It is not a de Polignac number, because 390139245 - 2² = 390139241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390139241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90117 + ... + 94346.

It is an arithmetic number, because the mean of its divisors is an integer number (28776384).

Almost surely, 2^390139245 is an apocalyptic number.

It is an amenable number.

390139245 is a deficient number, since it is larger than the sum of its proper divisors (300493971).

390139245 is a wasteful number, since it uses less digits than its factorization.

390139245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184521 (or 184518 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 390139245 is about 19751.9428158346. The cubic root of 390139245 is about 730.7012995353.

The spelling of 390139245 in words is "three hundred ninety million, one hundred thirty-nine thousand, two hundred forty-five".