11865831 has 4 divisors (see below), whose sum is σ = 15821112. Its totient is φ = 7910552.

The previous prime is 11865829. The next prime is 11865853. The reversal of 11865831 is 13856811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11865831 - 2¹ = 11865829 is a prime.

It is a super-2 number, since 2×11865831² = 281595890641122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11865792 and 11865801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11865871) 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, 1977636 + ... + 1977641.

It is an arithmetic number, because the mean of its divisors is an integer number (3955278).

Almost surely, 2^11865831 is an apocalyptic number.

11865831 is a deficient number, since it is larger than the sum of its proper divisors (3955281).

11865831 is an equidigital number, since it uses as much as digits as its factorization.

11865831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3955280.

The product of its digits is 5760, while the sum is 33.

The square root of 11865831 is about 3444.6815527709. The cubic root of 11865831 is about 228.0863976967.

The spelling of 11865831 in words is "eleven million, eight hundred sixty-five thousand, eight hundred thirty-one".