390648777 has 4 divisors (see below), whose sum is σ = 520865040. Its totient is φ = 260432516.

The previous prime is 390648773. The next prime is 390648809. The reversal of 390648777 is 777846093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 390648777 - 2² = 390648773 is a prime.

It is a super-4 number, since 4×390648777⁴ (a number of 35 digits) contains 4444 as substring.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (390648773) 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, 65108127 + ... + 65108132.

It is an arithmetic number, because the mean of its divisors is an integer number (130216260).

Almost surely, 2^390648777 is an apocalyptic number.

It is an amenable number.

390648777 is a deficient number, since it is larger than the sum of its proper divisors (130216263).

390648777 is a wasteful number, since it uses less digits than its factorization.

390648777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130216262.

The product of its (nonzero) digits is 1778112, while the sum is 51.

The square root of 390648777 is about 19764.8368827066. The cubic root of 390648777 is about 731.0192661178.

The spelling of 390648777 in words is "three hundred ninety million, six hundred forty-eight thousand, seven hundred seventy-seven".