11820537 has 12 divisors (see below), whose sum is σ = 17396964. Its totient is φ = 7731360.

The previous prime is 11820521. The next prime is 11820539. The reversal of 11820537 is 73502811.

11820537 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6456681 + 5363856 = 2541^2 + 2316^2 .

It is not a de Polignac number, because 11820537 - 2⁴ = 11820521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11820537.

It is not an unprimeable number, because it can be changed into a prime (11820539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11914 + ... + 12867.

It is an arithmetic number, because the mean of its divisors is an integer number (1449747).

Almost surely, 2^11820537 is an apocalyptic number.

It is an amenable number.

11820537 is a deficient number, since it is larger than the sum of its proper divisors (5576427).

11820537 is a wasteful number, since it uses less digits than its factorization.

11820537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24840 (or 24837 counting only the distinct ones).

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

The square root of 11820537 is about 3438.1007838631. The cubic root of 11820537 is about 227.7958121134.

The spelling of 11820537 in words is "eleven million, eight hundred twenty thousand, five hundred thirty-seven".