390786849 has 10 divisors (see below), whose sum is σ = 583768130. Its totient is φ = 260524512.

The previous prime is 390786839. The next prime is 390786863. The reversal of 390786849 is 948687093.

It can be written as a sum of positive squares in only one way, i.e., 213364449 + 177422400 = 14607^2 + 13320^2 .

It is not a de Polignac number, because 390786849 - 2⁴ = 390786833 is a prime.

It is a super-2 number, since 2×390786849² = 305428722702697602, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 390786795 and 390786804.

It is not an unprimeable number, because it can be changed into a prime (390786829) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2412184 + ... + 2412345.

It is an arithmetic number, because the mean of its divisors is an integer number (58376813).

Almost surely, 2^390786849 is an apocalyptic number.

It is an amenable number.

390786849 is a deficient number, since it is larger than the sum of its proper divisors (192981281).

390786849 is an equidigital number, since it uses as much as digits as its factorization.

390786849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4824541 (or 4824532 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 390786849 is about 19768.3294438352. The cubic root of 390786849 is about 731.1053804734.

The spelling of 390786849 in words is "three hundred ninety million, seven hundred eighty-six thousand, eight hundred forty-nine".