19138172 has 6 divisors (see below), whose sum is σ = 33491808. Its totient is φ = 9569084.

The previous prime is 19138151. The next prime is 19138177. The reversal of 19138172 is 27183191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19138177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2392268 + ... + 2392275.

It is an arithmetic number, because the mean of its divisors is an integer number (5581968).

Almost surely, 2^19138172 is an apocalyptic number.

It is an amenable number.

19138172 is a deficient number, since it is larger than the sum of its proper divisors (14353636).

19138172 is a wasteful number, since it uses less digits than its factorization.

19138172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4784547 (or 4784545 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 19138172 is about 4374.7196481603. The cubic root of 19138172 is about 267.4854424779.

The spelling of 19138172 in words is "nineteen million, one hundred thirty-eight thousand, one hundred seventy-two".