18421877 has 4 divisors (see below), whose sum is σ = 18435360. Its totient is φ = 18408396.

The previous prime is 18421867. The next prime is 18421889. The reversal of 18421877 is 77812481.

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.

It is a cyclic number.

It is not a de Polignac number, because 18421877 - 2⁶ = 18421813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18421877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421867) 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, 4427 + ... + 7512.

It is an arithmetic number, because the mean of its divisors is an integer number (4608840).

Almost surely, 2^18421877 is an apocalyptic number.

It is an amenable number.

18421877 is a deficient number, since it is larger than the sum of its proper divisors (13483).

18421877 is a wasteful number, since it uses less digits than its factorization.

18421877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13482.

The product of its digits is 25088, while the sum is 38.

The square root of 18421877 is about 4292.0714113351. The cubic root of 18421877 is about 264.1058125352.

The spelling of 18421877 in words is "eighteen million, four hundred twenty-one thousand, eight hundred seventy-seven".