11875821 has 16 divisors (see below), whose sum is σ = 16439808. Its totient is φ = 7617600.

The previous prime is 11875813. The next prime is 11875837. The reversal of 11875821 is 12857811.

It is not a de Polignac number, because 11875821 - 2³ = 11875813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11875811) 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, 25531 + ... + 25991.

It is an arithmetic number, because the mean of its divisors is an integer number (1027488).

It is a Poulet number, since it divides 2^11875820-1.

Almost surely, 2^11875821 is an apocalyptic number.

It is an amenable number.

11875821 is a deficient number, since it is larger than the sum of its proper divisors (4563987).

11875821 is a wasteful number, since it uses less digits than its factorization.

11875821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its digits is 4480, while the sum is 33.

The square root of 11875821 is about 3446.1313091639. The cubic root of 11875821 is about 228.1503893928.

The spelling of 11875821 in words is "eleven million, eight hundred seventy-five thousand, eight hundred twenty-one".