390649615 has 4 divisors (see below), whose sum is σ = 468779544. Its totient is φ = 312519688.

The previous prime is 390649607. The next prime is 390649639. The reversal of 390649615 is 516946093.

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 390649615 - 2³ = 390649607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39064957 + ... + 39064966.

It is an arithmetic number, because the mean of its divisors is an integer number (117194886).

Almost surely, 2^390649615 is an apocalyptic number.

390649615 is a deficient number, since it is larger than the sum of its proper divisors (78129929).

390649615 is an equidigital number, since it uses as much as digits as its factorization.

390649615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78129928.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 390649615 is about 19764.8580819595. The cubic root of 390649615 is about 731.0197888327.

The spelling of 390649615 in words is "three hundred ninety million, six hundred forty-nine thousand, six hundred fifteen".