18613899 has 6 divisors (see below), whose sum is σ = 26886756. Its totient is φ = 12409260.

The previous prime is 18613897. The next prime is 18613913. The reversal of 18613899 is 99831681.

It is not a de Polignac number, because 18613899 - 2¹ = 18613897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18613891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1034097 + ... + 1034114.

It is an arithmetic number, because the mean of its divisors is an integer number (4481126).

Almost surely, 2^18613899 is an apocalyptic number.

18613899 is a deficient number, since it is larger than the sum of its proper divisors (8272857).

18613899 is a wasteful number, since it uses less digits than its factorization.

18613899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068217 (or 2068214 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 18613899 is about 4314.3828063815. The cubic root of 18613899 is about 265.0202856193.

The spelling of 18613899 in words is "eighteen million, six hundred thirteen thousand, eight hundred ninety-nine".