18143396 has 6 divisors (see below), whose sum is σ = 31750950. Its totient is φ = 9071696.

The previous prime is 18143387. The next prime is 18143453. The reversal of 18143396 is 69334181.

It can be written as a sum of positive squares in only one way, i.e., 14668900 + 3474496 = 3830^2 + 1864^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2267921 + ... + 2267928.

It is an arithmetic number, because the mean of its divisors is an integer number (5291825).

Almost surely, 2^18143396 is an apocalyptic number.

It is an amenable number.

18143396 is a deficient number, since it is larger than the sum of its proper divisors (13607554).

18143396 is a wasteful number, since it uses less digits than its factorization.

18143396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535853 (or 4535851 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 18143396 is about 4259.5065441903. The cubic root of 18143396 is about 262.7682325435.

The spelling of 18143396 in words is "eighteen million, one hundred forty-three thousand, three hundred ninety-six".