18077121 has 16 divisors (see below), whose sum is σ = 27705600. Its totient is φ = 11635344.

The previous prime is 18077099. The next prime is 18077131. The reversal of 18077121 is 12177081.

It is not a de Polignac number, because 18077121 - 2¹¹ = 18075073 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (18077131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10761 + ... + 12326.

It is an arithmetic number, because the mean of its divisors is an integer number (1731600).

Almost surely, 2^18077121 is an apocalyptic number.

It is an amenable number.

18077121 is a deficient number, since it is larger than the sum of its proper divisors (9628479).

18077121 is a wasteful number, since it uses less digits than its factorization.

18077121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23125 (or 23119 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 18077121 is about 4251.7197696932. The cubic root of 18077121 is about 262.4478916976.

The spelling of 18077121 in words is "eighteen million, seventy-seven thousand, one hundred twenty-one".