390869691 has 16 divisors (see below), whose sum is σ = 552234240. Its totient is φ = 245224800.

The previous prime is 390869683. The next prime is 390869701. The reversal of 390869691 is 196968093.

It is not a de Polignac number, because 390869691 - 2³ = 390869683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (390869671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14100 + ... + 31313.

It is an arithmetic number, because the mean of its divisors is an integer number (34514640).

Almost surely, 2^390869691 is an apocalyptic number.

390869691 is a deficient number, since it is larger than the sum of its proper divisors (161364549).

390869691 is a wasteful number, since it uses less digits than its factorization.

390869691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45586.

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 390869691 is about 19770.4246540129. The cubic root of 390869691 is about 731.1570386027.

The spelling of 390869691 in words is "three hundred ninety million, eight hundred sixty-nine thousand, six hundred ninety-one".