18944380 has 72 divisors (see below), whose sum is σ = 49871808. Its totient is φ = 5991552.

The previous prime is 18944377. The next prime is 18944383. The reversal of 18944380 is 8344981.

It is an interprime number because it is at equal distance from previous prime (18944377) and next prime (18944383).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18944383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11997 + ... + 13483.

It is an arithmetic number, because the mean of its divisors is an integer number (692664).

Almost surely, 2^18944380 is an apocalyptic number.

18944380 is a gapful number since it is divisible by the number (10) 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 18944380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24935904).

18944380 is an abundant number, since it is smaller than the sum of its proper divisors (30927428).

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

18944380 is a wasteful number, since it uses less digits than its factorization.

18944380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18944380 is about 4352.5142159446. The cubic root of 18944380 is about 266.5795305582.

The spelling of 18944380 in words is "eighteen million, nine hundred forty-four thousand, three hundred eighty".