11921737 has 4 divisors (see below), whose sum is σ = 12039876. Its totient is φ = 11803600.

The previous prime is 11921729. The next prime is 11921753. The reversal of 11921737 is 73712911.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8785296 + 3136441 = 2964^2 + 1771^2 .

It is a cyclic number.

It is not a de Polignac number, because 11921737 - 2³ = 11921729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11921699 and 11921708.

It is not an unprimeable number, because it can be changed into a prime (11921137) 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, 58918 + ... + 59119.

It is an arithmetic number, because the mean of its divisors is an integer number (3009969).

Almost surely, 2^11921737 is an apocalyptic number.

It is an amenable number.

11921737 is a deficient number, since it is larger than the sum of its proper divisors (118139).

11921737 is a wasteful number, since it uses less digits than its factorization.

11921737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118138.

The product of its digits is 2646, while the sum is 31.

The square root of 11921737 is about 3452.7868454337. The cubic root of 11921737 is about 228.4440471605. Note that the first 3 decimals are identical.

The spelling of 11921737 in words is "eleven million, nine hundred twenty-one thousand, seven hundred thirty-seven".