17972809194 has 32 divisors (see below), whose sum is σ = 37843522560. Its totient is φ = 5674719600.

The previous prime is 17972809177. The next prime is 17972809199. The reversal of 17972809194 is 49190827971.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (17972809199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1385599 + ... + 1398509.

It is an arithmetic number, because the mean of its divisors is an integer number (1182610080).

Almost surely, 2^17972809194 is an apocalyptic number.

17972809194 is an abundant number, since it is smaller than the sum of its proper divisors (19870713366).

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

17972809194 is a wasteful number, since it uses less digits than its factorization.

17972809194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25146.

The product of its (nonzero) digits is 2286144, while the sum is 57.

The spelling of 17972809194 in words is "seventeen billion, nine hundred seventy-two million, eight hundred nine thousand, one hundred ninety-four".