19860172 has 12 divisors (see below), whose sum is σ = 35146440. Its totient is φ = 9818336.

The previous prime is 19860143. The next prime is 19860173. The reversal of 19860172 is 27106891.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19860173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27538 + ... + 28249.

It is an arithmetic number, because the mean of its divisors is an integer number (2928870).

Almost surely, 2^19860172 is an apocalyptic number.

It is an amenable number.

19860172 is a deficient number, since it is larger than the sum of its proper divisors (15286268).

19860172 is a wasteful number, since it uses less digits than its factorization.

19860172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55880 (or 55878 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 19860172 is about 4456.4752888353. The cubic root of 19860172 is about 270.8076957086.

The spelling of 19860172 in words is "nineteen million, eight hundred sixty thousand, one hundred seventy-two".