390669775 has 12 divisors (see below), whose sum is σ = 512926992. Its totient is φ = 294151040.

The previous prime is 390669737. The next prime is 390669779. The reversal of 390669775 is 577966093.

It is not a de Polignac number, because 390669775 - 2²³ = 382281167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390669779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 459187 + ... + 460036.

It is an arithmetic number, because the mean of its divisors is an integer number (42743916).

Almost surely, 2^390669775 is an apocalyptic number.

390669775 is a deficient number, since it is larger than the sum of its proper divisors (122257217).

390669775 is a wasteful number, since it uses less digits than its factorization.

390669775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919250 (or 919245 counting only the distinct ones).

The product of its (nonzero) digits is 2143260, while the sum is 52.

The square root of 390669775 is about 19765.3680714527. The cubic root of 390669775 is about 731.0323637036.

It can be divided in two parts, 39066 and 9775, that added together give a square (48841 = 221²).

The spelling of 390669775 in words is "three hundred ninety million, six hundred sixty-nine thousand, seven hundred seventy-five".