11907881 has 4 divisors (see below), whose sum is σ = 12132612. Its totient is φ = 11683152.

The previous prime is 11907877. The next prime is 11907919. The reversal of 11907881 is 18870911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18870911 = 1499 ⋅12589.

It can be written as a sum of positive squares in 2 ways, for example, as 10995856 + 912025 = 3316^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 11907881 - 2² = 11907877 is a prime.

It is a super-2 number, since 2×11907881² = 283595259820322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11907811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112286 + ... + 112391.

It is an arithmetic number, because the mean of its divisors is an integer number (3033153).

Almost surely, 2^11907881 is an apocalyptic number.

It is an amenable number.

11907881 is a deficient number, since it is larger than the sum of its proper divisors (224731).

11907881 is an equidigital number, since it uses as much as digits as its factorization.

11907881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224730.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 11907881 is about 3450.7797669512. The cubic root of 11907881 is about 228.3555100677.

The spelling of 11907881 in words is "eleven million, nine hundred seven thousand, eight hundred eighty-one".