3890879877921 has 16 divisors (see below), whose sum is σ = 5236267048320. Its totient is φ = 2569713880320.

The previous prime is 3890879877901. The next prime is 3890879877947. The reversal of 3890879877921 is 1297789780983.

3890879877921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3890879877921 - 2¹⁹ = 3890879353633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3890879877901) 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 15 ways as a sum of consecutive naturals, for example, 1121001 + ... + 3006393.

It is an arithmetic number, because the mean of its divisors is an integer number (327266690520).

Almost surely, 2^{3890879877921} is an apocalyptic number.

It is an amenable number.

3890879877921 is a deficient number, since it is larger than the sum of its proper divisors (1345387170399).

3890879877921 is a wasteful number, since it uses less digits than its factorization.

3890879877921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891816.

The product of its (nonzero) digits is 768144384, while the sum is 78.

The spelling of 3890879877921 in words is "three trillion, eight hundred ninety billion, eight hundred seventy-nine million, eight hundred seventy-seven thousand, nine hundred twenty-one".