11640537 has 16 divisors (see below), whose sum is σ = 17614080. Its totient is φ = 7594416.

The previous prime is 11640527. The next prime is 11640539. The reversal of 11640537 is 73504611.

11640537 is a `hidden beast` number, since 11 + 640 + 5 + 3 + 7 = 666.

It is not a de Polignac number, because 11640537 - 2¹² = 11636441 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 11640537.

It is not an unprimeable number, because it can be changed into a prime (11640539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3318 + ... + 5855.

It is an arithmetic number, because the mean of its divisors is an integer number (1100880).

Almost surely, 2^11640537 is an apocalyptic number.

It is an amenable number.

11640537 is a deficient number, since it is larger than the sum of its proper divisors (5973543).

11640537 is an equidigital number, since it uses as much as digits as its factorization.

11640537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9229 (or 9223 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 11640537 is about 3411.8231196825. The cubic root of 11640537 is about 226.6336214322.

The spelling of 11640537 in words is "eleven million, six hundred forty thousand, five hundred thirty-seven".