18149995 has 4 divisors (see below), whose sum is σ = 21780000. Its totient is φ = 14519992.

The previous prime is 18149983. The next prime is 18150019. The reversal of 18149995 is 59994181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59994181 = 13 ⋅4614937.

It is a cyclic number.

It is not a de Polignac number, because 18149995 - 2⁷ = 18149867 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814995 + ... + 1815004.

It is an arithmetic number, because the mean of its divisors is an integer number (5445000).

Almost surely, 2^18149995 is an apocalyptic number.

18149995 is a deficient number, since it is larger than the sum of its proper divisors (3630005).

18149995 is an equidigital number, since it uses as much as digits as its factorization.

18149995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630004.

The product of its digits is 116640, while the sum is 46.

The square root of 18149995 is about 4260.2810940125. The cubic root of 18149995 is about 262.8000861425.

It can be divided in two parts, 181 and 49995, that added together give a square (50176 = 224²).

The spelling of 18149995 in words is "eighteen million, one hundred forty-nine thousand, nine hundred ninety-five".