18871402 has 24 divisors (see below), whose sum is σ = 32199300. Its totient is φ = 8279040.

The previous prime is 18871397. The next prime is 18871403. The reversal of 18871402 is 20417881.

It can be written as a sum of positive squares in 2 ways, for example, as 17380561 + 1490841 = 4169^2 + 1221^2 .

It is a super-2 number, since 2×18871402² = 712259626891208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18871403) 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, 5674 + ... + 8362.

Almost surely, 2^18871402 is an apocalyptic number.

18871402 is a deficient number, since it is larger than the sum of its proper divisors (13327898).

18871402 is a wasteful number, since it uses less digits than its factorization.

18871402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742 (or 2731 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 18871402 is about 4344.1226962414. The cubic root of 18871402 is about 266.2367820221.

The spelling of 18871402 in words is "eighteen million, eight hundred seventy-one thousand, four hundred two".