19908400774 has 8 divisors (see below), whose sum is σ = 29866593240. Its totient is φ = 9952869696.

The previous prime is 19908400769. The next prime is 19908400793. The reversal of 19908400774 is 47700480991.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646539 + ... + 676630.

It is an arithmetic number, because the mean of its divisors is an integer number (3733324155).

Almost surely, 2^19908400774 is an apocalyptic number.

19908400774 is a deficient number, since it is larger than the sum of its proper divisors (9958192466).

19908400774 is a wasteful number, since it uses less digits than its factorization.

19908400774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330694.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 19908400774 in words is "nineteen billion, nine hundred eight million, four hundred thousand, seven hundred seventy-four".