11947979 has 4 divisors (see below), whose sum is σ = 12576840. Its totient is φ = 11319120.

The previous prime is 11947973. The next prime is 11947981. The reversal of 11947979 is 97974911.

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 11947979 - 2¹⁶ = 11882443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11947973) 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, 314402 + ... + 314439.

It is an arithmetic number, because the mean of its divisors is an integer number (3144210).

Almost surely, 2^11947979 is an apocalyptic number.

11947979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

11947979 is a deficient number, since it is larger than the sum of its proper divisors (628861).

11947979 is an equidigital number, since it uses as much as digits as its factorization.

11947979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628860.

The product of its digits is 142884, while the sum is 47.

The square root of 11947979 is about 3456.5848752779. The cubic root of 11947979 is about 228.6115405236.

The spelling of 11947979 in words is "eleven million, nine hundred forty-seven thousand, nine hundred seventy-nine".