18948280 has 48 divisors (see below), whose sum is σ = 46181880. Its totient is φ = 6993792.

The previous prime is 18948277. The next prime is 18948283. The reversal of 18948280 is 8284981.

It is an interprime number because it is at equal distance from previous prime (18948277) and next prime (18948283).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18948283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5359 + ... + 8161.

Almost surely, 2^18948280 is an apocalyptic number.

18948280 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 18948280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23090940).

18948280 is an abundant number, since it is smaller than the sum of its proper divisors (27233600).

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

18948280 is a wasteful number, since it uses less digits than its factorization.

18948280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840 (or 2823 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 18948280 is about 4352.9622098061. The cubic root of 18948280 is about 266.5978225061.

The spelling of 18948280 in words is "eighteen million, nine hundred forty-eight thousand, two hundred eighty".