11820957 has 4 divisors (see below), whose sum is σ = 15761280. Its totient is φ = 7880636.

The previous prime is 11820947. The next prime is 11820959. The reversal of 11820957 is 75902811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75902811 = 3 ⋅25300937.

It is a cyclic number.

It is not a de Polignac number, because 11820957 - 2¹¹ = 11818909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11820959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1970157 + ... + 1970162.

It is an arithmetic number, because the mean of its divisors is an integer number (3940320).

Almost surely, 2^11820957 is an apocalyptic number.

It is an amenable number.

11820957 is a deficient number, since it is larger than the sum of its proper divisors (3940323).

11820957 is an equidigital number, since it uses as much as digits as its factorization.

11820957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940322.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 11820957 is about 3438.1618635544. The cubic root of 11820957 is about 227.7985100480.

The spelling of 11820957 in words is "eleven million, eight hundred twenty thousand, nine hundred fifty-seven".