18149404 has 72 divisors (see below), whose sum is σ = 42230160. Its totient is φ = 6741504.

The previous prime is 18149401. The next prime is 18149407. The reversal of 18149404 is 40494181.

It is an interprime number because it is at equal distance from previous prime (18149401) and next prime (18149407).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18149401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43107 + ... + 43525.

It is an arithmetic number, because the mean of its divisors is an integer number (586530).

Almost surely, 2^18149404 is an apocalyptic number.

18149404 is a gapful number since it is divisible by the number (14) 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 18149404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21115080).

18149404 is an abundant number, since it is smaller than the sum of its proper divisors (24080756).

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

18149404 is a wasteful number, since it uses less digits than its factorization.

18149404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18149404 is about 4260.2117318274. The cubic root of 18149404 is about 262.7972336801.

The spelling of 18149404 in words is "eighteen million, one hundred forty-nine thousand, four hundred four".