18751980 has 96 divisors (see below), whose sum is σ = 58564800. Its totient is φ = 4451328.

The previous prime is 18751979. The next prime is 18751981. The reversal of 18751980 is 8915781.

It is an interprime number because it is at equal distance from previous prime (18751979) and next prime (18751981).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18751981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22206 + ... + 23034.

It is an arithmetic number, because the mean of its divisors is an integer number (610050).

Almost surely, 2^18751980 is an apocalyptic number.

18751980 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 18751980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29282400).

18751980 is an abundant number, since it is smaller than the sum of its proper divisors (39812820).

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

18751980 is a wasteful number, since it uses less digits than its factorization.

18751980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 18751980 is about 4330.3556435933. The cubic root of 18751980 is about 265.6739933619.

The spelling of 18751980 in words is "eighteen million, seven hundred fifty-one thousand, nine hundred eighty".