18002745 has 48 divisors (see below), whose sum is σ = 33510672. Its totient is φ = 8908800.

The previous prime is 18002737. The next prime is 18002771. The reversal of 18002745 is 54720081.

It can be written as a sum of positive squares in 8 ways, for example, as 788544 + 17214201 = 888^2 + 4149^2 .

It is not a de Polignac number, because 18002745 - 2³ = 18002737 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77149 + ... + 77381.

It is an arithmetic number, because the mean of its divisors is an integer number (698139).

Almost surely, 2^18002745 is an apocalyptic number.

18002745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18002745 is a deficient number, since it is larger than the sum of its proper divisors (15507927).

18002745 is a wasteful number, since it uses less digits than its factorization.

18002745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 359 counting only the distinct ones).

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

The square root of 18002745 is about 4242.9641761391. The cubic root of 18002745 is about 262.0874608458.

The spelling of 18002745 in words is "eighteen million, two thousand, seven hundred forty-five".