19807138 has 12 divisors (see below), whose sum is σ = 32172498. Its totient is φ = 9141600.

The previous prime is 19807121. The next prime is 19807187. The reversal of 19807138 is 83170891.

It can be written as a sum of positive squares in 3 ways, for example, as 9199089 + 10608049 = 3033^2 + 3257^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19807097 and 19807106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28963 + ... + 29638.

Almost surely, 2^19807138 is an apocalyptic number.

19807138 is a deficient number, since it is larger than the sum of its proper divisors (12365360).

19807138 is a wasteful number, since it uses less digits than its factorization.

19807138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58629 (or 58616 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 19807138 is about 4450.5210930856. The cubic root of 19807138 is about 270.5664286089.

The spelling of 19807138 in words is "nineteen million, eight hundred seven thousand, one hundred thirty-eight".