18149339 has 4 divisors (see below), whose sum is σ = 19545456. Its totient is φ = 16753224.

The previous prime is 18149309. The next prime is 18149363. The reversal of 18149339 is 93394181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18149339 - 2¹⁶ = 18083803 is a prime.

It is a super-2 number, since 2×18149339² = 658797012273842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18149309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698039 + ... + 698064.

It is an arithmetic number, because the mean of its divisors is an integer number (4886364).

Almost surely, 2^18149339 is an apocalyptic number.

18149339 is a deficient number, since it is larger than the sum of its proper divisors (1396117).

18149339 is a wasteful number, since it uses less digits than its factorization.

18149339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396116.

The product of its digits is 23328, while the sum is 38.

The square root of 18149339 is about 4260.2041030918. The cubic root of 18149339 is about 262.7969199537.

The spelling of 18149339 in words is "eighteen million, one hundred forty-nine thousand, three hundred thirty-nine".