18147899 has 16 divisors (see below), whose sum is σ = 22753536. Its totient is φ = 14061600.

The previous prime is 18147893. The next prime is 18147917. The reversal of 18147899 is 99874181.

It is not a de Polignac number, because 18147899 - 2²⁰ = 17099323 is a prime.

It is a super-2 number, since 2×18147899² = 658692476228402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18147893) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15689 + ... + 16805.

It is an arithmetic number, because the mean of its divisors is an integer number (1422096).

Almost surely, 2^18147899 is an apocalyptic number.

18147899 is a deficient number, since it is larger than the sum of its proper divisors (4605637).

18147899 is a wasteful number, since it uses less digits than its factorization.

18147899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346.

The product of its digits is 145152, while the sum is 47.

The square root of 18147899 is about 4260.0350937522. The cubic root of 18147899 is about 262.7899695155.

The spelling of 18147899 in words is "eighteen million, one hundred forty-seven thousand, eight hundred ninety-nine".