19408402979 has 8 divisors (see below), whose sum is σ = 22182381408. Its totient is φ = 16634761920.

The previous prime is 19408402943. The next prime is 19408403029. The reversal of 19408402979 is 97920480491.

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

It is not a de Polignac number, because 19408402979 - 2⁸ = 19408402723 is a prime.

It is a super-2 number, since 2×19408402979² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19408402979.

It is not an unprimeable number, because it can be changed into a prime (19408482979) 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, 54089 + ... + 204309.

It is an arithmetic number, because the mean of its divisors is an integer number (2772797676).

Almost surely, 2^19408402979 is an apocalyptic number.

19408402979 is a deficient number, since it is larger than the sum of its proper divisors (2773978429).

19408402979 is a wasteful number, since it uses less digits than its factorization.

19408402979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168685.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 19408402979 in words is "nineteen billion, four hundred eight million, four hundred two thousand, nine hundred seventy-nine".