18874644 has 12 divisors (see below), whose sum is σ = 44040864. Its totient is φ = 6291544.

The previous prime is 18874643. The next prime is 18874649. The reversal of 18874644 is 44647881.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×18874644² = 712504372253472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18874596 and 18874605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18874643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 786432 + ... + 786455.

It is an arithmetic number, because the mean of its divisors is an integer number (3670072).

Almost surely, 2^18874644 is an apocalyptic number.

It is an amenable number.

18874644 is an abundant number, since it is smaller than the sum of its proper divisors (25166220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18874644 is a wasteful number, since it uses less digits than its factorization.

18874644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572894 (or 1572892 counting only the distinct ones).

The product of its digits is 172032, while the sum is 42.

The square root of 18874644 is about 4344.4958280565. The cubic root of 18874644 is about 266.2520271397.

The spelling of 18874644 in words is "eighteen million, eight hundred seventy-four thousand, six hundred forty-four".