18198645 has 16 divisors (see below), whose sum is σ = 29283072. Its totient is φ = 9650880.

The previous prime is 18198641. The next prime is 18198659. The reversal of 18198645 is 54689181.

It is not a de Polignac number, because 18198645 - 2² = 18198641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18198597 and 18198606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637 + ... + 6066.

It is an arithmetic number, because the mean of its divisors is an integer number (1830192).

Almost surely, 2^18198645 is an apocalyptic number.

18198645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18198645 is a deficient number, since it is larger than the sum of its proper divisors (11084427).

18198645 is a wasteful number, since it uses less digits than its factorization.

18198645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6892.

The product of its digits is 69120, while the sum is 42.

The square root of 18198645 is about 4265.9869901349. The cubic root of 18198645 is about 263.0346834123.

The spelling of 18198645 in words is "eighteen million, one hundred ninety-eight thousand, six hundred forty-five".