390819772 has 24 divisors (see below), whose sum is σ = 815625216. Its totient is φ = 160211568.

The previous prime is 390819761. The next prime is 390819787. The reversal of 390819772 is 277918093.

It is a happy number.

It is a super-2 number, since 2×390819772² = 305480188372263968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302788 + ... + 304075.

It is an arithmetic number, because the mean of its divisors is an integer number (33984384).

Almost surely, 2^390819772 is an apocalyptic number.

It is an amenable number.

390819772 is an abundant number, since it is smaller than the sum of its proper divisors (424805444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390819772 is a wasteful number, since it uses less digits than its factorization.

390819772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606897 (or 606895 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 390819772 is about 19769.1621471422. The cubic root of 390819772 is about 731.1259112790.

The spelling of 390819772 in words is "three hundred ninety million, eight hundred nineteen thousand, seven hundred seventy-two".