388902684421 has 4 divisors (see below), whose sum is σ = 391700545600. Its totient is φ = 386104823244.

The previous prime is 388902684337. The next prime is 388902684433. The reversal of 388902684421 is 124486209883.

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 388902684421 - 2⁷ = 388902684293 is a prime.

It is a super-2 number, since 2×388902684421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388902684451) 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, 1398930381 + ... + 1398930658.

It is an arithmetic number, because the mean of its divisors is an integer number (97925136400).

Almost surely, 2^388902684421 is an apocalyptic number.

It is an amenable number.

388902684421 is a deficient number, since it is larger than the sum of its proper divisors (2797861179).

388902684421 is a wasteful number, since it uses less digits than its factorization.

388902684421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797861178.

The product of its (nonzero) digits is 5308416, while the sum is 55.

The spelling of 388902684421 in words is "three hundred eighty-eight billion, nine hundred two million, six hundred eighty-four thousand, four hundred twenty-one".