11920861 has 4 divisors (see below), whose sum is σ = 11947072. Its totient is φ = 11894652.

The previous prime is 11920837. The next prime is 11920871. The reversal of 11920861 is 16802911.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 11920861 - 2¹¹ = 11918813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11920801) 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, 12411 + ... + 13336.

It is an arithmetic number, because the mean of its divisors is an integer number (2986768).

Almost surely, 2^11920861 is an apocalyptic number.

It is an amenable number.

11920861 is a deficient number, since it is larger than the sum of its proper divisors (26211).

11920861 is an equidigital number, since it uses as much as digits as its factorization.

11920861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26210.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 11920861 is about 3452.6599890519. The cubic root of 11920861 is about 228.4384517262.

The spelling of 11920861 in words is "eleven million, nine hundred twenty thousand, eight hundred sixty-one".