18161892 has 72 divisors (see below), whose sum is σ = 53079936. Its totient is φ = 5128704.

The previous prime is 18161851. The next prime is 18161903. The reversal of 18161892 is 29816181.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between odd and even.

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, 24073 + ... + 24815.

Almost surely, 2^18161892 is an apocalyptic number.

18161892 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 18161892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26539968).

18161892 is an abundant number, since it is smaller than the sum of its proper divisors (34918044).

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

18161892 is a wasteful number, since it uses less digits than its factorization.

18161892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857 (or 852 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 18161892 is about 4261.6771346502. The cubic root of 18161892 is about 262.8574938671.

The spelling of 18161892 in words is "eighteen million, one hundred sixty-one thousand, eight hundred ninety-two".