18821052 has 48 divisors (see below), whose sum is σ = 49072800. Its totient is φ = 6238080.

The previous prime is 18821051. The next prime is 18821053. The reversal of 18821052 is 25012881.

It is an interprime number because it is at equal distance from previous prime (18821051) and next prime (18821053).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18821051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24352 + ... + 25112.

It is an arithmetic number, because the mean of its divisors is an integer number (1022350).

Almost surely, 2^18821052 is an apocalyptic number.

18821052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18821052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24536400).

18821052 is an abundant number, since it is smaller than the sum of its proper divisors (30251748).

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

18821052 is a wasteful number, since it uses less digits than its factorization.

18821052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003 (or 995 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18821052 is about 4338.3236393796. The cubic root of 18821052 is about 265.9997927147. Note that the first 3 decimals are identical.

The spelling of 18821052 in words is "eighteen million, eight hundred twenty-one thousand, fifty-two".