390112821 has 64 divisors (see below), whose sum is σ = 729907200. Its totient is φ = 200648448.

The previous prime is 390112819. The next prime is 390112841. The reversal of 390112821 is 128211093.

It is not a de Polignac number, because 390112821 - 2¹ = 390112819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390112841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 71260 + ... + 76538.

It is an arithmetic number, because the mean of its divisors is an integer number (11404800).

Almost surely, 2^390112821 is an apocalyptic number.

It is an amenable number.

390112821 is a deficient number, since it is larger than the sum of its proper divisors (339794379).

390112821 is a wasteful number, since it uses less digits than its factorization.

390112821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5335 (or 5329 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 390112821 is about 19751.2739082825. The cubic root of 390112821 is about 730.6848024450.

The spelling of 390112821 in words is "three hundred ninety million, one hundred twelve thousand, eight hundred twenty-one".