18077081 has 16 divisors (see below), whose sum is σ = 20357568. Its totient is φ = 15912000.

The previous prime is 18077077. The next prime is 18077099.

18077081 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 18077081 - 2² = 18077077 is a prime.

It is a super-2 number, since 2×18077081² = 653561714961122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18077021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58730 + ... + 59036.

It is an arithmetic number, because the mean of its divisors is an integer number (1272348).

Almost surely, 2^18077081 is an apocalyptic number.

18077081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18077081 is a deficient number, since it is larger than the sum of its proper divisors (2280487).

18077081 is a wasteful number, since it uses less digits than its factorization.

18077081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472.

The product of its (nonzero) digits is 3136, while the sum is 32.

The square root of 18077081 is about 4251.7150657117. The cubic root of 18077081 is about 262.4476981210.

It can be divided in two parts, 1807 and 7081, that added together give a palindrome (8888).

The spelling of 18077081 in words is "eighteen million, seventy-seven thousand, eighty-one".