18250000 has 70 divisors (see below), whose sum is σ = 44804114. Its totient is φ = 7200000.

The previous prime is 18249997. The next prime is 18250021. The reversal of 18250000 is 5281.

It is a happy number.

It can be written as a sum of positive squares in 7 ways, for example, as 18249984 + 16 = 4272^2 + 4^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 249964 + ... + 250036.

Almost surely, 2^18250000 is an apocalyptic number.

18250000 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 18250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22402057).

18250000 is an abundant number, since it is smaller than the sum of its proper divisors (26554114).

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

18250000 is an frugal number, since it uses more digits than its factorization.

18250000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 18250000 is about 4272.0018726588. The cubic root of 18250000 is about 263.2818714086.

Subtracting from 18250000 its sum of digits (16), we obtain a square (18249984 = 4272²).

Adding to 18250000 its reverse (5281), we get a palindrome (18255281).

The spelling of 18250000 in words is "eighteen million, two hundred fifty thousand".