18339955 has 16 divisors (see below), whose sum is σ = 22569984. Its totient is φ = 14302080.

The previous prime is 18339913. The next prime is 18340019. The reversal of 18339955 is 55993381.

It is not a de Polignac number, because 18339955 - 2¹⁹ = 17815667 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47694 + ... + 48076.

It is an arithmetic number, because the mean of its divisors is an integer number (1410624).

Almost surely, 2^18339955 is an apocalyptic number.

18339955 is a deficient number, since it is larger than the sum of its proper divisors (4230029).

18339955 is a wasteful number, since it uses less digits than its factorization.

18339955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606.

The product of its digits is 145800, while the sum is 43.

The square root of 18339955 is about 4282.5173671568. The cubic root of 18339955 is about 263.7137383419.

The spelling of 18339955 in words is "eighteen million, three hundred thirty-nine thousand, nine hundred fifty-five".