19117872 has 30 divisors (see below), whose sum is σ = 53503892. Its totient is φ = 6372576.

The previous prime is 19117841. The next prime is 19117907. The reversal of 19117872 is 27871191.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66238 + ... + 66525.

Almost surely, 2^19117872 is an apocalyptic number.

19117872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19117872 is an abundant number, since it is smaller than the sum of its proper divisors (34386020).

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

19117872 is a wasteful number, since it uses less digits than its factorization.

19117872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132777 (or 132768 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 19117872 is about 4372.3988839080. The cubic root of 19117872 is about 267.3908344266.

Subtracting from 19117872 its sum of digits (36), we obtain a triangular number (19117836 = T₆₁₈₃).

The spelling of 19117872 in words is "nineteen million, one hundred seventeen thousand, eight hundred seventy-two".