11215998 has 24 divisors (see below), whose sum is σ = 24432408. Its totient is φ = 3718512.

The previous prime is 11215993. The next prime is 11216003. The reversal of 11215998 is 89951211.

It is an interprime number because it is at equal distance from previous prime (11215993) and next prime (11216003).

It is a super-2 number, since 2×11215998² = 251597222272008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11215993) 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, 1965 + ... + 5127.

It is an arithmetic number, because the mean of its divisors is an integer number (1018017).

Almost surely, 2^11215998 is an apocalyptic number.

11215998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11215998 is an abundant number, since it is smaller than the sum of its proper divisors (13216410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11215998 is a wasteful number, since it uses less digits than its factorization.

11215998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368 (or 3365 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 11215998 is about 3349.0294116356. The cubic root of 11215998 is about 223.8442662213.

It can be divided in two parts, 112 and 15998, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 11215998 in words is "eleven million, two hundred fifteen thousand, nine hundred ninety-eight".