11977999 has 16 divisors (see below), whose sum is σ = 13870080. Its totient is φ = 10229760.

The previous prime is 11977967. The next prime is 11978023. The reversal of 11977999 is 99977911.

It is a cyclic number.

It is not a de Polignac number, because 11977999 - 2⁵ = 11977967 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 (11977949) 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 15 ways as a sum of consecutive naturals, for example, 46479 + ... + 46735.

It is an arithmetic number, because the mean of its divisors is an integer number (866880).

Almost surely, 2^11977999 is an apocalyptic number.

11977999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

11977999 is a deficient number, since it is larger than the sum of its proper divisors (1892081).

11977999 is a wasteful number, since it uses less digits than its factorization.

11977999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510.

The product of its digits is 321489, while the sum is 52.

The square root of 11977999 is about 3460.9245874477. The cubic root of 11977999 is about 228.8028470374.

The spelling of 11977999 in words is "eleven million, nine hundred seventy-seven thousand, nine hundred ninety-nine".