18452772 has 90 divisors (see below), whose sum is σ = 52390338. Its totient is φ = 5660928.

The previous prime is 18452771. The next prime is 18452773. The reversal of 18452772 is 27725481.

It is an interprime number because it is at equal distance from previous prime (18452771) and next prime (18452773).

It can be written as a sum of positive squares in 3 ways, for example, as 254016 + 18198756 = 504^2 + 4266^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18452771) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 54588 + ... + 54924.

Almost surely, 2^18452772 is an apocalyptic number.

18452772 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 18452772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26195169).

18452772 is an abundant number, since it is smaller than the sum of its proper divisors (33937566).

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

18452772 is a wasteful number, since it uses less digits than its factorization.

18452772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379 (or 355 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 18452772 is about 4295.6689816605. The cubic root of 18452772 is about 264.2533724520.

The spelling of 18452772 in words is "eighteen million, four hundred fifty-two thousand, seven hundred seventy-two".