390491086 has 4 divisors (see below), whose sum is σ = 585736632. Its totient is φ = 195245542.

The previous prime is 390491077. The next prime is 390491111. The reversal of 390491086 is 680194093.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 97622770 + ... + 97622773.

It is an arithmetic number, because the mean of its divisors is an integer number (146434158).

Almost surely, 2^390491086 is an apocalyptic number.

390491086 is a deficient number, since it is larger than the sum of its proper divisors (195245546).

390491086 is a wasteful number, since it uses less digits than its factorization.

390491086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195245545.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 390491086 is about 19760.8472996479. The cubic root of 390491086 is about 730.9208907312.

The spelling of 390491086 in words is "three hundred ninety million, four hundred ninety-one thousand, eighty-six".