19849138 has 24 divisors (see below), whose sum is σ = 31673628. Its totient is φ = 9326592.

The previous prime is 19849133. The next prime is 19849139. The reversal of 19849138 is 83194891.

It can be written as a sum of positive squares in 2 ways, for example, as 17330569 + 2518569 = 4163^2 + 1587^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19849094 and 19849103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19849133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77106 + ... + 77362.

Almost surely, 2^19849138 is an apocalyptic number.

19849138 is a deficient number, since it is larger than the sum of its proper divisors (11824490).

19849138 is a wasteful number, since it uses less digits than its factorization.

19849138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 355 counting only the distinct ones).

The product of its digits is 62208, while the sum is 43.

The square root of 19849138 is about 4455.2371429588. The cubic root of 19849138 is about 270.7575342487.

The spelling of 19849138 in words is "nineteen million, eight hundred forty-nine thousand, one hundred thirty-eight".