819400218939 has 8 divisors (see below), whose sum is σ = 1213926250320. Its totient is φ = 546266812608.

The previous prime is 819400218919. The next prime is 819400219007. The reversal of 819400218939 is 939812004918.

819400218939 is a `hidden beast` number, since 8 + 19 + 400 + 218 + 9 + 3 + 9 = 666.

It is not a de Polignac number, because 819400218939 - 2¹³ = 819400210747 is a prime.

It is a super-2 number, since 2×819400218939² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (819400218919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15174078102 + ... + 15174078155.

It is an arithmetic number, because the mean of its divisors is an integer number (151740781290).

Almost surely, 2^819400218939 is an apocalyptic number.

819400218939 is a deficient number, since it is larger than the sum of its proper divisors (394526031381).

819400218939 is a wasteful number, since it uses less digits than its factorization.

819400218939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30348156266 (or 30348156260 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 819400218939 in words is "eight hundred nineteen billion, four hundred million, two hundred eighteen thousand, nine hundred thirty-nine".