19420172 has 12 divisors (see below), whose sum is σ = 34080480. Its totient is φ = 9682896.

The previous prime is 19420139. The next prime is 19420189. The reversal of 19420172 is 27102491.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5147 + ... + 8082.

It is an arithmetic number, because the mean of its divisors is an integer number (2840040).

Almost surely, 2^19420172 is an apocalyptic number.

It is an amenable number.

19420172 is a deficient number, since it is larger than the sum of its proper divisors (14660308).

19420172 is a wasteful number, since it uses less digits than its factorization.

19420172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13600 (or 13598 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 19420172 is about 4406.8324225003. The cubic root of 19420172 is about 268.7928367269.

The spelling of 19420172 in words is "nineteen million, four hundred twenty thousand, one hundred seventy-two".