19402071836 has 12 divisors (see below), whose sum is σ = 38804143728. Its totient is φ = 8315173632.

The previous prime is 19402071779. The next prime is 19402071853. The reversal of 19402071836 is 63817020491.

19402071836 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 19402071793 and 19402071802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346465541 + ... + 346465596.

It is an arithmetic number, because the mean of its divisors is an integer number (3233678644).

Almost surely, 2^19402071836 is an apocalyptic number.

It is an amenable number.

19402071836 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19402071836 is a wasteful number, since it uses less digits than its factorization.

19402071836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692931148 (or 692931146 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 19402071836 in words is "nineteen billion, four hundred two million, seventy-one thousand, eight hundred thirty-six".