18479380 has 48 divisors (see below), whose sum is σ = 40602240. Its totient is φ = 7056000.

The previous prime is 18479359. The next prime is 18479387. The reversal of 18479380 is 8397481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18479387) 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, 87475 + ... + 87685.

It is an arithmetic number, because the mean of its divisors is an integer number (845880).

Almost surely, 2^18479380 is an apocalyptic number.

18479380 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 18479380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20301120).

18479380 is an abundant number, since it is smaller than the sum of its proper divisors (22122860).

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

18479380 is a wasteful number, since it uses less digits than its factorization.

18479380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 18479380 is about 4298.7649389098. The cubic root of 18479380 is about 264.3803249565.

The spelling of 18479380 in words is "eighteen million, four hundred seventy-nine thousand, three hundred eighty".