390921279 has 8 divisors (see below), whose sum is σ = 595689600. Its totient is φ = 223383576.

The previous prime is 390921259. The next prime is 390921283. The reversal of 390921279 is 972129093.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 390921279 - 2¹⁷ = 390790207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 390921279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390921229) 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 7 ways as a sum of consecutive naturals, for example, 9307629 + ... + 9307670.

It is an arithmetic number, because the mean of its divisors is an integer number (74461200).

Almost surely, 2^390921279 is an apocalyptic number.

390921279 is a deficient number, since it is larger than the sum of its proper divisors (204768321).

390921279 is a wasteful number, since it uses less digits than its factorization.

390921279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18615309.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 390921279 is about 19771.7292870401. The cubic root of 390921279 is about 731.1892038578.

The spelling of 390921279 in words is "three hundred ninety million, nine hundred twenty-one thousand, two hundred seventy-nine".