390897284 has 12 divisors (see below), whose sum is σ = 690124764. Its totient is φ = 193718784.

The previous prime is 390897281. The next prime is 390897289. The reversal of 390897284 is 482798093.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 117722500 + 273174784 = 10850^2 + 16528^2 .

It is not an unprimeable number, because it can be changed into a prime (390897281) 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, 431957 + ... + 432860.

It is an arithmetic number, because the mean of its divisors is an integer number (57510397).

Almost surely, 2^390897284 is an apocalyptic number.

It is an amenable number.

390897284 is a deficient number, since it is larger than the sum of its proper divisors (299227480).

390897284 is a wasteful number, since it uses less digits than its factorization.

390897284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864934 (or 864932 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 390897284 is about 19771.1224769865. The cubic root of 390897284 is about 731.1742432636.

The spelling of 390897284 in words is "three hundred ninety million, eight hundred ninety-seven thousand, two hundred eighty-four".