390087985 has 16 divisors (see below), whose sum is σ = 543750912. Its totient is φ = 263102400.

The previous prime is 390087977. The next prime is 390087991. The reversal of 390087985 is 589780093.

It is not a de Polignac number, because 390087985 - 2³ = 390087977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89221 + ... + 93490.

It is an arithmetic number, because the mean of its divisors is an integer number (33984432).

Almost surely, 2^390087985 is an apocalyptic number.

390087985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

390087985 is a deficient number, since it is larger than the sum of its proper divisors (153662927).

390087985 is a wasteful number, since it uses less digits than its factorization.

390087985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182784.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 390087985 is about 19750.6451793353. The cubic root of 390087985 is about 730.6692960992.

The spelling of 390087985 in words is "three hundred ninety million, eighty-seven thousand, nine hundred eighty-five".