18149516 has 48 divisors (see below), whose sum is σ = 40008192. Its totient is φ = 7056720.

The previous prime is 18149501. The next prime is 18149531. The reversal of 18149516 is 61594181.

It is an interprime number because it is at equal distance from previous prime (18149501) and next prime (18149531).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37025 + ... + 37511.

It is an arithmetic number, because the mean of its divisors is an integer number (833504).

Almost surely, 2^18149516 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 18149516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20004096).

18149516 is an abundant number, since it is smaller than the sum of its proper divisors (21858676).

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

18149516 is a wasteful number, since it uses less digits than its factorization.

18149516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 507 counting only the distinct ones).

The product of its digits is 8640, while the sum is 35.

The square root of 18149516 is about 4260.2248766937. The cubic root of 18149516 is about 262.7977742530.

The spelling of 18149516 in words is "eighteen million, one hundred forty-nine thousand, five hundred sixteen".