390249187 has 4 divisors (see below), whose sum is σ = 396863640. Its totient is φ = 383634736.

The previous prime is 390249179. The next prime is 390249191. The reversal of 390249187 is 781942093.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 390249187 - 2³ = 390249179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390249787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3307138 + ... + 3307255.

It is an arithmetic number, because the mean of its divisors is an integer number (99215910).

Almost surely, 2^390249187 is an apocalyptic number.

390249187 is a deficient number, since it is larger than the sum of its proper divisors (6614453).

390249187 is an equidigital number, since it uses as much as digits as its factorization.

390249187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6614452.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 390249187 is about 19754.7256877943. The cubic root of 390249187 is about 730.7699307725.

The spelling of 390249187 in words is "three hundred ninety million, two hundred forty-nine thousand, one hundred eighty-seven".