11967993 has 14 divisors (see below), whose sum is σ = 17944874. Its totient is φ = 7978176.

The previous prime is 11967979. The next prime is 11967997. The reversal of 11967993 is 39976911.

It can be written as a sum of positive squares in only one way, i.e., 8982009 + 2985984 = 2997^2 + 1728^2 .

It is not a de Polignac number, because 11967993 - 2⁹ = 11967481 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 (11967997) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 7480 + ... + 8937.

Almost surely, 2^11967993 is an apocalyptic number.

It is an amenable number.

11967993 is a deficient number, since it is larger than the sum of its proper divisors (5976881).

11967993 is an frugal number, since it uses more digits than its factorization.

11967993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16435 (or 16420 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 11967993 is about 3459.4787179574. The cubic root of 11967993 is about 228.7391179989.

The spelling of 11967993 in words is "eleven million, nine hundred sixty-seven thousand, nine hundred ninety-three".