390782809922 has 6 divisors (see below), whose sum is σ = 586175540979. Its totient is φ = 195390962930.

The previous prime is 390782809849. The next prime is 390782809931. The reversal of 390782809922 is 229908287093.

It can be written as a sum of positive squares in only one way, i.e., 195391404961 + 195391404961 = 442031^2 + 442031^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=442031.

It is a super-2 number, since 2×390782809922² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 663047 + ... + 1105077.

Almost surely, 2^390782809922 is an apocalyptic number.

390782809922 is a deficient number, since it is larger than the sum of its proper divisors (195392731057).

390782809922 is an frugal number, since it uses more digits than its factorization.

390782809922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884064 (or 442033 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 59.

The spelling of 390782809922 in words is "three hundred ninety billion, seven hundred eighty-two million, eight hundred nine thousand, nine hundred twenty-two".