390028977 has 48 divisors (see below), whose sum is σ = 647010000. Its totient is φ = 224280576.

The previous prime is 390028939. The next prime is 390028981. The reversal of 390028977 is 779820093.

It can be written as a sum of positive squares in 8 ways, for example, as 15374241 + 374654736 = 3921^2 + 19356^2 .

It is not a de Polignac number, because 390028977 - 2¹⁵ = 389996209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (390028927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 311649 + ... + 312897.

It is an arithmetic number, because the mean of its divisors is an integer number (13479375).

Almost surely, 2^390028977 is an apocalyptic number.

It is an amenable number.

390028977 is a deficient number, since it is larger than the sum of its proper divisors (256981023).

390028977 is a wasteful number, since it uses less digits than its factorization.

390028977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442 (or 1439 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 390028977 is about 19749.1512982204. The cubic root of 390028977 is about 730.6324518404.

The spelling of 390028977 in words is "three hundred ninety million, twenty-eight thousand, nine hundred seventy-seven".