18200745 has 12 divisors (see below), whose sum is σ = 31548036. Its totient is φ = 9707040.

The previous prime is 18200737. The next prime is 18200759. The reversal of 18200745 is 54700281.

18200745 = 808² + 809² + ... + 834².

It can be written as a sum of positive squares in 2 ways, for example, as 4562496 + 13638249 = 2136^2 + 3693^2 .

It is not a de Polignac number, because 18200745 - 2³ = 18200737 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202186 + ... + 202275.

It is an arithmetic number, because the mean of its divisors is an integer number (2629003).

Almost surely, 2^18200745 is an apocalyptic number.

18200745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18200745 is a deficient number, since it is larger than the sum of its proper divisors (13347291).

18200745 is a wasteful number, since it uses less digits than its factorization.

18200745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404472 (or 404469 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 18200745 is about 4266.2331159935. The cubic root of 18200745 is about 263.0448004950.

The spelling of 18200745 in words is "eighteen million, two hundred thousand, seven hundred forty-five".