18154980 has 108 divisors (see below), whose sum is σ = 58667700. Its totient is φ = 4543488.

The previous prime is 18154979. The next prime is 18154999. The reversal of 18154980 is 8945181.

18154980 = T₂₀₀ + T₂₀₁ + ... + T₄₈₈.

It can be written as a sum of positive squares in 6 ways, for example, as 2090916 + 16064064 = 1446^2 + 4008^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 51846 + ... + 52194.

Almost surely, 2^18154980 is an apocalyptic number.

18154980 is a gapful number since it is divisible by the number (10) 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 18154980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29333850).

18154980 is an abundant number, since it is smaller than the sum of its proper divisors (40512720).

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

18154980 is a wasteful number, since it uses less digits than its factorization.

18154980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 18154980 is about 4260.8661091379. The cubic root of 18154980 is about 262.8241437893.

The spelling of 18154980 in words is "eighteen million, one hundred fifty-four thousand, nine hundred eighty".