18146977 has 4 divisors (see below), whose sum is σ = 18936000. Its totient is φ = 17357956.

The previous prime is 18146971. The next prime is 18146981. The reversal of 18146977 is 77964181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77964181 = 23 ⋅3389747.

It is a cyclic number.

It is not a de Polignac number, because 18146977 - 2¹⁵ = 18114209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18146971) 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 3 ways as a sum of consecutive naturals, for example, 394477 + ... + 394522.

It is an arithmetic number, because the mean of its divisors is an integer number (4734000).

Almost surely, 2^18146977 is an apocalyptic number.

It is an amenable number.

18146977 is a deficient number, since it is larger than the sum of its proper divisors (789023).

18146977 is an equidigital number, since it uses as much as digits as its factorization.

18146977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789022.

The product of its digits is 84672, while the sum is 43.

The square root of 18146977 is about 4259.9268773067. The cubic root of 18146977 is about 262.7855191114.

The spelling of 18146977 in words is "eighteen million, one hundred forty-six thousand, nine hundred seventy-seven".