18690232 has 32 divisors (see below), whose sum is σ = 38494080. Its totient is φ = 8436960.

The previous prime is 18690227. The next prime is 18690247. The reversal of 18690232 is 23209681.

It is a junction number, because it is equal to n+sod(n) for n = 18690194 and 18690203.

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 7 ways as a sum of consecutive naturals, for example, 13693 + ... + 14995.

It is an arithmetic number, because the mean of its divisors is an integer number (1202940).

Almost surely, 2^18690232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18690232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19247040).

18690232 is an abundant number, since it is smaller than the sum of its proper divisors (19803848).

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

18690232 is a wasteful number, since it uses less digits than its factorization.

18690232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483 (or 1479 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 18690232 is about 4323.2200961783. The cubic root of 18690232 is about 265.3820619297.

The spelling of 18690232 in words is "eighteen million, six hundred ninety thousand, two hundred thirty-two".