18001395 has 12 divisors (see below), whose sum is σ = 31202496. Its totient is φ = 9600720.

The previous prime is 18001393. The next prime is 18001409. The reversal of 18001395 is 59310081.

It is not a de Polignac number, because 18001395 - 2¹ = 18001393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18001393) 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, 199971 + ... + 200060.

It is an arithmetic number, because the mean of its divisors is an integer number (2600208).

Almost surely, 2^18001395 is an apocalyptic number.

18001395 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18001395 is a deficient number, since it is larger than the sum of its proper divisors (13201101).

18001395 is a wasteful number, since it uses less digits than its factorization.

18001395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400042 (or 400039 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 18001395 is about 4242.8050862607. The cubic root of 18001395 is about 262.0809094946.

The spelling of 18001395 in words is "eighteen million, one thousand, three hundred ninety-five".