19172272 has 40 divisors (see below), whose sum is σ = 43068672. Its totient is φ = 8097600.

The previous prime is 19172261. The next prime is 19172299. The reversal of 19172272 is 27227191.

It is a happy number.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6747 + ... + 9157.

Almost surely, 2^19172272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19172272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21534336).

19172272 is an abundant number, since it is smaller than the sum of its proper divisors (23896400).

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

19172272 is a wasteful number, since it uses less digits than its factorization.

19172272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497 (or 2491 counting only the distinct ones).

The product of its digits is 3528, while the sum is 31.

The square root of 19172272 is about 4378.6153062355. The cubic root of 19172272 is about 267.6442148969.

The spelling of 19172272 in words is "nineteen million, one hundred seventy-two thousand, two hundred seventy-two".