390390387 has 4 divisors (see below), whose sum is σ = 520520520. Its totient is φ = 260260256.

The previous prime is 390390323. The next prime is 390390437. The reversal of 390390387 is 783093093.

It is a happy number.

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 390390387 - 2⁶ = 390390323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (390390317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65065062 + ... + 65065067.

It is an arithmetic number, because the mean of its divisors is an integer number (130130130).

Almost surely, 2^390390387 is an apocalyptic number.

390390387 is a deficient number, since it is larger than the sum of its proper divisors (130130133).

390390387 is a wasteful number, since it uses less digits than its factorization.

390390387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130130132.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 390390387 is about 19758.2991929974. The cubic root of 390390387 is about 730.8580558948.

The spelling of 390390387 in words is "three hundred ninety million, three hundred ninety thousand, three hundred eighty-seven".