12157520 has 20 divisors (see below), whose sum is σ = 28266420. Its totient is φ = 4862976.

The previous prime is 12157469. The next prime is 12157553. The reversal of 12157520 is 2575121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7246864 + 4910656 = 2692^2 + 2216^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75905 + ... + 76064.

It is an arithmetic number, because the mean of its divisors is an integer number (1413321).

Almost surely, 2^12157520 is an apocalyptic number.

12157520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12157520 is an abundant number, since it is smaller than the sum of its proper divisors (16108900).

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

12157520 is a wasteful number, since it uses less digits than its factorization.

12157520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151982 (or 151976 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 12157520 is about 3486.7635423126. The cubic root of 12157520 is about 229.9402491292.

The spelling of 12157520 in words is "twelve million, one hundred fifty-seven thousand, five hundred twenty".