390850087 has 4 divisors (see below), whose sum is σ = 393339736. Its totient is φ = 388360440.

The previous prime is 390850079. The next prime is 390850099. The reversal of 390850087 is 780058093.

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 390850087 - 2³ = 390850079 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 (390850027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1244589 + ... + 1244902.

It is an arithmetic number, because the mean of its divisors is an integer number (98334934).

Almost surely, 2^390850087 is an apocalyptic number.

390850087 is a deficient number, since it is larger than the sum of its proper divisors (2489649).

390850087 is a wasteful number, since it uses less digits than its factorization.

390850087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489648.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 390850087 is about 19769.9288567258. The cubic root of 390850087 is about 731.1448147145.

The spelling of 390850087 in words is "three hundred ninety million, eight hundred fifty thousand, eighty-seven".