18098644 has 6 divisors (see below), whose sum is σ = 31672634. Its totient is φ = 9049320.

The previous prime is 18098627. The next prime is 18098651. The reversal of 18098644 is 44689081.

It can be written as a sum of positive squares in only one way, i.e., 17724100 + 374544 = 4210^2 + 612^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18098597 and 18098606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2262327 + ... + 2262334.

Almost surely, 2^18098644 is an apocalyptic number.

It is an amenable number.

18098644 is a deficient number, since it is larger than the sum of its proper divisors (13573990).

18098644 is a wasteful number, since it uses less digits than its factorization.

18098644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4524665 (or 4524663 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 18098644 is about 4254.2501101839. The cubic root of 18098644 is about 262.5520090447.

The spelling of 18098644 in words is "eighteen million, ninety-eight thousand, six hundred forty-four".