19139139 has 8 divisors (see below), whose sum is σ = 28354320. Its totient is φ = 12759408.

The previous prime is 19139129. The next prime is 19139143. The reversal of 19139139 is 93193191.

It is not a de Polignac number, because 19139139 - 2²⁰ = 18090563 is a prime.

It is a super-2 number, since 2×19139139² = 732613283322642, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (19139119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354402 + ... + 354455.

It is an arithmetic number, because the mean of its divisors is an integer number (3544290).

Almost surely, 2^19139139 is an apocalyptic number.

19139139 is a deficient number, since it is larger than the sum of its proper divisors (9215181).

19139139 is an equidigital number, since it uses as much as digits as its factorization.

19139139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708866 (or 708860 counting only the distinct ones).

The product of its digits is 6561, while the sum is 36.

The square root of 19139139 is about 4374.8301681322. The cubic root of 19139139 is about 267.4899475071.

The spelling of 19139139 in words is "nineteen million, one hundred thirty-nine thousand, one hundred thirty-nine".