11998897 has 4 divisors (see below), whose sum is σ = 12085360. Its totient is φ = 11912436.

The previous prime is 11998859. The next prime is 11998927. The reversal of 11998897 is 79889911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79889911 = 659 ⋅121229.

It is a cyclic number.

It is not a de Polignac number, because 11998897 - 2⁷ = 11998769 is a prime.

It is a cake number, because a cake can be divided into 11998897 parts by 416 planar cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11998807) 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 3 ways as a sum of consecutive naturals, for example, 43023 + ... + 43300.

It is an arithmetic number, because the mean of its divisors is an integer number (3021340).

Almost surely, 2^11998897 is an apocalyptic number.

It is an amenable number.

11998897 is a deficient number, since it is larger than the sum of its proper divisors (86463).

11998897 is an equidigital number, since it uses as much as digits as its factorization.

11998897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86462.

The product of its digits is 326592, while the sum is 52.

The square root of 11998897 is about 3463.9424071425. The cubic root of 11998897 is about 228.9358337412.

The spelling of 11998897 in words is "eleven million, nine hundred ninety-eight thousand, eight hundred ninety-seven".