11998550 has 24 divisors (see below), whose sum is σ = 23040192. Its totient is φ = 4644000.

The previous prime is 11998541. The next prime is 11998577. The reversal of 11998550 is 5589911.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 2321 + ... + 5420.

It is an arithmetic number, because the mean of its divisors is an integer number (960008).

Almost surely, 2^11998550 is an apocalyptic number.

11998550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11998550 is a deficient number, since it is larger than the sum of its proper divisors (11041642).

11998550 is a wasteful number, since it uses less digits than its factorization.

11998550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7784 (or 7779 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 11998550 is about 3463.8923193425. The cubic root of 11998550 is about 228.9336268301.

The spelling of 11998550 in words is "eleven million, nine hundred ninety-eight thousand, five hundred fifty".