390708997 has 6 divisors (see below), whose sum is σ = 454498278. Its totient is φ = 334893384.

The previous prime is 390708947. The next prime is 390709003. The reversal of 390708997 is 799807093.

It can be written as a sum of positive squares in only one way, i.e., 220641316 + 170067681 = 14854^2 + 13041^2 .

It is not a de Polignac number, because 390708997 - 2⁷ = 390708869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390708907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3986778 + ... + 3986875.

It is an arithmetic number, because the mean of its divisors is an integer number (75749713).

Almost surely, 2^390708997 is an apocalyptic number.

It is an amenable number.

390708997 is a deficient number, since it is larger than the sum of its proper divisors (63789281).

390708997 is an equidigital number, since it uses as much as digits as its factorization.

390708997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7973667 (or 7973660 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 390708997 is about 19766.3602365231. The cubic root of 390708997 is about 731.0568273245.

The spelling of 390708997 in words is "three hundred ninety million, seven hundred eight thousand, nine hundred ninety-seven".