19139972 has 12 divisors (see below), whose sum is σ = 33572700. Its totient is φ = 9547776.

The previous prime is 19139963. The next prime is 19139983. The reversal of 19139972 is 27993191.

It can be written as a sum of positive squares in 2 ways, for example, as 5494336 + 13645636 = 2344^2 + 3694^2 .

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, 3533 + ... + 7124.

It is an arithmetic number, because the mean of its divisors is an integer number (2797725).

Almost surely, 2^19139972 is an apocalyptic number.

It is an amenable number.

19139972 is a deficient number, since it is larger than the sum of its proper divisors (14432728).

19139972 is a wasteful number, since it uses less digits than its factorization.

19139972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11110 (or 11108 counting only the distinct ones).

The product of its digits is 30618, while the sum is 41.

The square root of 19139972 is about 4374.9253707921. The cubic root of 19139972 is about 267.4938281395.

The spelling of 19139972 in words is "nineteen million, one hundred thirty-nine thousand, nine hundred seventy-two".