390091865 has 8 divisors (see below), whose sum is σ = 469193928. Its totient is φ = 311351040.

The previous prime is 390091861. The next prime is 390091873. The reversal of 390091865 is 568190093.

It can be written as a sum of positive squares in 4 ways, for example, as 582169 + 389509696 = 763^2 + 19736^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 390091865 - 2² = 390091861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390091861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87926 + ... + 92255.

It is an arithmetic number, because the mean of its divisors is an integer number (58649241).

Almost surely, 2^390091865 is an apocalyptic number.

It is an amenable number.

390091865 is a deficient number, since it is larger than the sum of its proper divisors (79102063).

390091865 is a wasteful number, since it uses less digits than its factorization.

390091865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180619.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 390091865 is about 19750.7434037304. The cubic root of 390091865 is about 730.6717186189.

The spelling of 390091865 in words is "three hundred ninety million, ninety-one thousand, eight hundred sixty-five".