11998567 has 8 divisors (see below), whose sum is σ = 13744512. Its totient is φ = 10260600.

The previous prime is 11998541. The next prime is 11998577. The reversal of 11998567 is 76589911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11998567 - 2⁷ = 11998439 is a prime.

It is a super-2 number, since 2×11998567² = 287931220106978, 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 (11998507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1692 + ... + 5182.

It is an arithmetic number, because the mean of its divisors is an integer number (1718064).

Almost surely, 2^11998567 is an apocalyptic number.

11998567 is a deficient number, since it is larger than the sum of its proper divisors (1745945).

11998567 is an equidigital number, since it uses as much as digits as its factorization.

11998567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989.

The product of its digits is 136080, while the sum is 46.

The square root of 11998567 is about 3463.8947732285. The cubic root of 11998567 is about 228.9337349506.

The spelling of 11998567 in words is "eleven million, nine hundred ninety-eight thousand, five hundred sixty-seven".