18077013 has 28 divisors (see below), whose sum is σ = 27451788. Its totient is φ = 11897280.

The previous prime is 18077009. The next prime is 18077021. The reversal of 18077013 is 31077081.

It can be written as a sum of positive squares in 2 ways, for example, as 3992004 + 14085009 = 1998^2 + 3753^2 .

It is not a de Polignac number, because 18077013 - 2² = 18077009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18077513) 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 27 ways as a sum of consecutive naturals, for example, 99783 + ... + 99963.

It is an arithmetic number, because the mean of its divisors is an integer number (980421).

Almost surely, 2^18077013 is an apocalyptic number.

It is an amenable number.

18077013 is a deficient number, since it is larger than the sum of its proper divisors (9374775).

18077013 is an equidigital number, since it uses as much as digits as its factorization.

18077013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

The square root of 18077013 is about 4251.7070689313. The cubic root of 18077013 is about 262.4473690401.

The spelling of 18077013 in words is "eighteen million, seventy-seven thousand, thirteen".