390700669 has 4 divisors (see below), whose sum is σ = 397105660. Its totient is φ = 384295680.

The previous prime is 390700633. The next prime is 390700679. The reversal of 390700669 is 966007093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 966007093 = 199 ⋅4854307.

It can be written as a sum of positive squares in 2 ways, for example, as 15697444 + 375003225 = 3962^2 + 19365^2 .

It is a cyclic number.

It is not a de Polignac number, because 390700669 - 2¹¹ = 390698621 is a prime.

It is a super-2 number, since 2×390700669² = 305294025514095122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390700679) 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, 3202404 + ... + 3202525.

It is an arithmetic number, because the mean of its divisors is an integer number (99276415).

Almost surely, 2^390700669 is an apocalyptic number.

It is an amenable number.

390700669 is a deficient number, since it is larger than the sum of its proper divisors (6404991).

390700669 is an equidigital number, since it uses as much as digits as its factorization.

390700669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6404990.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 390700669 is about 19766.1495744619. The cubic root of 390700669 is about 731.0516331053.

The spelling of 390700669 in words is "three hundred ninety million, seven hundred thousand, six hundred sixty-nine".