18914280 has 256 divisors, whose sum is σ = 74649600. Its totient is φ = 3717120.

The previous prime is 18914249. The next prime is 18914299. The reversal of 18914280 is 8241981.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 212476 + ... + 212564.

It is an arithmetic number, because the mean of its divisors is an integer number (291600).

Almost surely, 2^18914280 is an apocalyptic number.

18914280 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 18914280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37324800).

18914280 is an abundant number, since it is smaller than the sum of its proper divisors (55735320).

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

18914280 is a wasteful number, since it uses less digits than its factorization.

18914280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 18914280 is about 4349.0550697824. The cubic root of 18914280 is about 266.4382697142.

The spelling of 18914280 in words is "eighteen million, nine hundred fourteen thousand, two hundred eighty".