18201995 has 32 divisors (see below), whose sum is σ = 26265600. Its totient is φ = 11846016.

The previous prime is 18201979. The next prime is 18202003. The reversal of 18201995 is 59910281.

It is not a de Polignac number, because 18201995 - 2⁴ = 18201979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80072 + ... + 80298.

It is an arithmetic number, because the mean of its divisors is an integer number (820800).

Almost surely, 2^18201995 is an apocalyptic number.

18201995 is a deficient number, since it is larger than the sum of its proper divisors (8063605).

18201995 is a wasteful number, since it uses less digits than its factorization.

18201995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 18201995 is about 4266.3796127396. The cubic root of 18201995 is about 263.0508221986.

The spelling of 18201995 in words is "eighteen million, two hundred one thousand, nine hundred ninety-five".