18772284 has 36 divisors (see below), whose sum is σ = 46538744. Its totient is φ = 5888256.

The previous prime is 18772279. The next prime is 18772289. The reversal of 18772284 is 48227781.

It is an interprime number because it is at equal distance from previous prime (18772279) and next prime (18772289).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772289) 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 11 ways as a sum of consecutive naturals, for example, 762 + ... + 6174.

Almost surely, 2^18772284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18772284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23269372).

18772284 is an abundant number, since it is smaller than the sum of its proper divisors (27766460).

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

18772284 is a wasteful number, since it uses less digits than its factorization.

18772284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5454 (or 5435 counting only the distinct ones).

The product of its digits is 50176, while the sum is 39.

The square root of 18772284 is about 4332.6993895261. The cubic root of 18772284 is about 265.7698463337.

The spelling of 18772284 in words is "eighteen million, seven hundred seventy-two thousand, two hundred eighty-four".