19139698 has 4 divisors (see below), whose sum is σ = 28709550. Its totient is φ = 9569848.

The previous prime is 19139663. The next prime is 19139711. The reversal of 19139698 is 89693191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17114769 + 2024929 = 4137^2 + 1423^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4784923 + ... + 4784926.

Almost surely, 2^19139698 is an apocalyptic number.

19139698 is a deficient number, since it is larger than the sum of its proper divisors (9569852).

19139698 is an equidigital number, since it uses as much as digits as its factorization.

19139698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9569851.

The product of its digits is 104976, while the sum is 46.

The square root of 19139698 is about 4374.8940558601. The cubic root of 19139698 is about 267.4925516894.

It can be divided in two parts, 1913 and 9698, that added together give a palindrome (11611).

The spelling of 19139698 in words is "nineteen million, one hundred thirty-nine thousand, six hundred ninety-eight".