18077997 has 16 divisors (see below), whose sum is σ = 27630720. Its totient is φ = 10299072.

The previous prime is 18077993. The next prime is 18077999. The reversal of 18077997 is 79977081.

It is not a de Polignac number, because 18077997 - 2² = 18077993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18077993) 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, 7063 + ... + 9275.

It is an arithmetic number, because the mean of its divisors is an integer number (1726920).

Almost surely, 2^18077997 is an apocalyptic number.

It is an amenable number.

18077997 is a deficient number, since it is larger than the sum of its proper divisors (9552723).

18077997 is a wasteful number, since it uses less digits than its factorization.

18077997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612.

The product of its (nonzero) digits is 222264, while the sum is 48.

The square root of 18077997 is about 4251.8227855827. The cubic root of 18077997 is about 262.4521309538.

The spelling of 18077997 in words is "eighteen million, seventy-seven thousand, nine hundred ninety-seven".