19442500194 has 64 divisors (see below), whose sum is σ = 44562873600. Its totient is φ = 5602037760.

The previous prime is 19442500169. The next prime is 19442500213. The reversal of 19442500194 is 49100524491.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227034 + ... + 300714.

It is an arithmetic number, because the mean of its divisors is an integer number (696294900).

Almost surely, 2^19442500194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19442500194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22281436800).

19442500194 is an abundant number, since it is smaller than the sum of its proper divisors (25120373406).

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

19442500194 is a wasteful number, since it uses less digits than its factorization.

19442500194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73915.

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 19442500194 in words is "nineteen billion, four hundred forty-two million, five hundred thousand, one hundred ninety-four".