18959481 has 8 divisors (see below), whose sum is σ = 28088160. Its totient is φ = 12639636.

The previous prime is 18959419. The next prime is 18959483. The reversal of 18959481 is 18495981.

It is not a de Polignac number, because 18959481 - 2¹⁴ = 18943097 is a prime.

It is a super-2 number, since 2×18959481² = 718923839578722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18959483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351075 + ... + 351128.

It is an arithmetic number, because the mean of its divisors is an integer number (3511020).

Almost surely, 2^18959481 is an apocalyptic number.

It is an amenable number.

18959481 is a deficient number, since it is larger than the sum of its proper divisors (9128679).

18959481 is an equidigital number, since it uses as much as digits as its factorization.

18959481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702212 (or 702206 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 18959481 is about 4354.2486148588. The cubic root of 18959481 is about 266.6503439662.

The spelling of 18959481 in words is "eighteen million, nine hundred fifty-nine thousand, four hundred eighty-one".