18423955 has 16 divisors (see below), whose sum is σ = 24204384. Its totient is φ = 13351680.

The previous prime is 18423949. The next prime is 18423967. The reversal of 18423955 is 55932481.

It is not a de Polignac number, because 18423955 - 2¹³ = 18415763 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

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, 24769 + ... + 25501.

It is an arithmetic number, because the mean of its divisors is an integer number (1512774).

Almost surely, 2^18423955 is an apocalyptic number.

18423955 is a deficient number, since it is larger than the sum of its proper divisors (5780429).

18423955 is a wasteful number, since it uses less digits than its factorization.

18423955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206.

The product of its digits is 43200, while the sum is 37.

The square root of 18423955 is about 4292.3134787664. The cubic root of 18423955 is about 264.1157425990.

The spelling of 18423955 in words is "eighteen million, four hundred twenty-three thousand, nine hundred fifty-five".