18172898 has 24 divisors (see below), whose sum is σ = 30238272. Its totient is φ = 8174144.

The previous prime is 18172897. The next prime is 18172901. The reversal of 18172898 is 89827181.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18172897) 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, 12611 + ... + 13977.

It is an arithmetic number, because the mean of its divisors is an integer number (1259928).

Almost surely, 2^18172898 is an apocalyptic number.

18172898 is a deficient number, since it is larger than the sum of its proper divisors (12065374).

18172898 is a wasteful number, since it uses less digits than its factorization.

18172898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 1409 counting only the distinct ones).

The product of its digits is 64512, while the sum is 44.

The square root of 18172898 is about 4262.9682147537. The cubic root of 18172898 is about 262.9105798450.

The spelling of 18172898 in words is "eighteen million, one hundred seventy-two thousand, eight hundred ninety-eight".