18081630 has 96 divisors (see below), whose sum is σ = 55770624. Its totient is φ = 4129056.

The previous prime is 18081619. The next prime is 18081631. The reversal of 18081630 is 3618081.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18081594 and 18081603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081631) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16479 + ... + 17541.

It is an arithmetic number, because the mean of its divisors is an integer number (580944).

Almost surely, 2^18081630 is an apocalyptic number.

18081630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18081630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27885312).

18081630 is an abundant number, since it is smaller than the sum of its proper divisors (37688994).

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

18081630 is a wasteful number, since it uses less digits than its factorization.

18081630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092 (or 1080 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18081630 is about 4252.2499926509. The cubic root of 18081630 is about 262.4697107909.

It can be divided in two parts, 180 and 81630, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 18081630 in words is "eighteen million, eighty-one thousand, six hundred thirty".