19712172 has 24 divisors (see below), whose sum is σ = 46405296. Its totient is φ = 6512128.

The previous prime is 19712153. The next prime is 19712191. The reversal of 19712172 is 27121791.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19712153) and next prime (19712191).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5913 + ... + 8624.

It is an arithmetic number, because the mean of its divisors is an integer number (1933554).

Almost surely, 2^19712172 is an apocalyptic number.

19712172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19712172 is an abundant number, since it is smaller than the sum of its proper divisors (26693124).

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

19712172 is a wasteful number, since it uses less digits than its factorization.

19712172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14657 (or 14655 counting only the distinct ones).

The product of its digits is 1764, while the sum is 30.

The square root of 19712172 is about 4439.8391862769. The cubic root of 19712172 is about 270.1333223594.

The spelling of 19712172 in words is "nineteen million, seven hundred twelve thousand, one hundred seventy-two".