19390493874 has 32 divisors (see below), whose sum is σ = 40755401280. Its totient is φ = 6142554432.

The previous prime is 19390493849. The next prime is 19390493897. The reversal of 19390493874 is 47839409391.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1006089 + ... + 1025180.

It is an arithmetic number, because the mean of its divisors is an integer number (1273606290).

Almost surely, 2^19390493874 is an apocalyptic number.

19390493874 is an abundant number, since it is smaller than the sum of its proper divisors (21364907406).

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

19390493874 is a wasteful number, since it uses less digits than its factorization.

19390493874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031354.

The product of its (nonzero) digits is 5878656, while the sum is 57.

The spelling of 19390493874 in words is "nineteen billion, three hundred ninety million, four hundred ninety-three thousand, eight hundred seventy-four".