11998775 has 6 divisors (see below), whose sum is σ = 14878512. Its totient is φ = 9599000.

The previous prime is 11998769. The next prime is 11998807. The reversal of 11998775 is 57789911.

11998775 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11998775 - 2⁴ = 11998759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 239951 + ... + 240000.

It is an arithmetic number, because the mean of its divisors is an integer number (2479752).

Almost surely, 2^11998775 is an apocalyptic number.

11998775 is a deficient number, since it is larger than the sum of its proper divisors (2879737).

11998775 is an equidigital number, since it uses as much as digits as its factorization.

11998775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479961 (or 479956 counting only the distinct ones).

The product of its digits is 158760, while the sum is 47.

The square root of 11998775 is about 3463.9247971052. The cubic root of 11998775 is about 228.9350578292.

The spelling of 11998775 in words is "eleven million, nine hundred ninety-eight thousand, seven hundred seventy-five".