11997869 has 12 divisors (see below), whose sum is σ = 13739796. Its totient is φ = 10378752.

The previous prime is 11997863. The next prime is 11997877. The reversal of 11997869 is 96879911.

It can be written as a sum of positive squares in 6 ways, for example, as 1532644 + 10465225 = 1238^2 + 3235^2 .

It is not a de Polignac number, because 11997869 - 2⁸ = 11997613 is a prime.

It is a super-2 number, since 2×11997869² = 287897721082322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11997863) 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 11 ways as a sum of consecutive naturals, for example, 51377 + ... + 51609.

It is an arithmetic number, because the mean of its divisors is an integer number (1144983).

Almost surely, 2^11997869 is an apocalyptic number.

It is an amenable number.

11997869 is a deficient number, since it is larger than the sum of its proper divisors (1741927).

11997869 is an equidigital number, since it uses as much as digits as its factorization.

11997869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 263 counting only the distinct ones).

The product of its digits is 244944, while the sum is 50.

The square root of 11997869 is about 3463.7940181252. The cubic root of 11997869 is about 228.9292955636.

The spelling of 11997869 in words is "eleven million, nine hundred ninety-seven thousand, eight hundred sixty-nine".