18880386 has 48 divisors (see below), whose sum is σ = 44323200. Its totient is φ = 5345760.

The previous prime is 18880369. The next prime is 18880403. The reversal of 18880386 is 68308881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18880369) and next prime (18880403).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43591 + ... + 44021.

It is an arithmetic number, because the mean of its divisors is an integer number (923400).

Almost surely, 2^18880386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18880386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22161600).

18880386 is an abundant number, since it is smaller than the sum of its proper divisors (25442814).

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

18880386 is a wasteful number, since it uses less digits than its factorization.

18880386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 18880386 is about 4345.1566139784. The cubic root of 18880386 is about 266.2790239250.

The spelling of 18880386 in words is "eighteen million, eight hundred eighty thousand, three hundred eighty-six".