18478692 has 42 divisors (see below), whose sum is σ = 48492038. Its totient is φ = 6158592.

The previous prime is 18478679. The next prime is 18478693. The reversal of 18478692 is 29687481.

It can be written as a sum of positive squares in only one way, i.e., 14699556 + 3779136 = 3834^2 + 1944^2 .

It is not an unprimeable number, because it can be changed into a prime (18478693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 253 + ... + 6084.

Almost surely, 2^18478692 is an apocalyptic number.

18478692 is a gapful number since it is divisible by the number (12) 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 18478692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24246019).

18478692 is an abundant number, since it is smaller than the sum of its proper divisors (30013346).

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

18478692 is an equidigital number, since it uses as much as digits as its factorization.

18478692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6359 (or 6342 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 18478692 is about 4298.6849151805. The cubic root of 18478692 is about 264.3770438955.

The spelling of 18478692 in words is "eighteen million, four hundred seventy-eight thousand, six hundred ninety-two".