11973989 has 2 divisors, whose sum is σ = 11973990. Its totient is φ = 11973988.

The previous prime is 11973979. The next prime is 11974003. The reversal of 11973989 is 98937911.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7317025 + 4656964 = 2705^2 + 2158^2 .

It is a cyclic number.

It is not a de Polignac number, because 11973989 - 2²⁰ = 10925413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11973959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5986994 + 5986995.

It is an arithmetic number, because the mean of its divisors is an integer number (5986995).

Almost surely, 2^11973989 is an apocalyptic number.

It is an amenable number.

11973989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11973989 is an equidigital number, since it uses as much as digits as its factorization.

11973989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 47.

The square root of 11973989 is about 3460.3452139924. The cubic root of 11973989 is about 228.7773112802. Note that the first 3 decimals are identical.

The spelling of 11973989 in words is "eleven million, nine hundred seventy-three thousand, nine hundred eighty-nine".