12137540 has 24 divisors (see below), whose sum is σ = 25666200. Its totient is φ = 4821248.

The previous prime is 12137533. The next prime is 12137551. The reversal of 12137540 is 4573121.

It can be written as a sum of positive squares in 4 ways, for example, as 179776 + 11957764 = 424^2 + 3458^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 944 + ... + 5016.

It is an arithmetic number, because the mean of its divisors is an integer number (1069425).

Almost surely, 2^12137540 is an apocalyptic number.

12137540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12137540 is an abundant number, since it is smaller than the sum of its proper divisors (13528660).

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

12137540 is a wasteful number, since it uses less digits than its factorization.

12137540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231 (or 4229 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 12137540 is about 3483.8972430311. The cubic root of 12137540 is about 229.8142167030.

The spelling of 12137540 in words is "twelve million, one hundred thirty-seven thousand, five hundred forty".