19072138 has 8 divisors (see below), whose sum is σ = 29077380. Its totient is φ = 9379680.

The previous prime is 19072121. The next prime is 19072139. The reversal of 19072138 is 83127091.

It can be written as a sum of positive squares in 2 ways, for example, as 17363889 + 1708249 = 4167^2 + 1307^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (19072139) 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, 78043 + ... + 78286.

Almost surely, 2^19072138 is an apocalyptic number.

19072138 is a deficient number, since it is larger than the sum of its proper divisors (10005242).

19072138 is a wasteful number, since it uses less digits than its factorization.

19072138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156392.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 19072138 is about 4367.1659002149. The cubic root of 19072138 is about 267.1774456712.

The spelling of 19072138 in words is "nineteen million, seventy-two thousand, one hundred thirty-eight".