12157380 has 144 divisors (see below), whose sum is σ = 40687920. Its totient is φ = 2924544.

The previous prime is 12157367. The next prime is 12157391. The reversal of 12157380 is 8375121.

12157380 is a `hidden beast` number, since 12 + 1 + 573 + 80 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 213444 + 11943936 = 462^2 + 3456^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88672 + ... + 88808.

It is an arithmetic number, because the mean of its divisors is an integer number (282555).

Almost surely, 2^12157380 is an apocalyptic number.

12157380 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 12157380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20343960).

12157380 is an abundant number, since it is smaller than the sum of its proper divisors (28530540).

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

12157380 is a wasteful number, since it uses less digits than its factorization.

12157380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 12157380 is about 3486.7434663307. The cubic root of 12157380 is about 229.9393664996.

The spelling of 12157380 in words is "twelve million, one hundred fifty-seven thousand, three hundred eighty".