11989550 has 24 divisors (see below), whose sum is σ = 22671912. Its totient is φ = 4716000.

The previous prime is 11989547. The next prime is 11989553. The reversal of 11989550 is 5598911.

It is an interprime number because it is at equal distance from previous prime (11989547) and next prime (11989553).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1085 + ... + 5015.

It is an arithmetic number, because the mean of its divisors is an integer number (944663).

Almost surely, 2^11989550 is an apocalyptic number.

11989550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11989550 is a deficient number, since it is larger than the sum of its proper divisors (10682362).

11989550 is a wasteful number, since it uses less digits than its factorization.

11989550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004 (or 3999 counting only the distinct ones).

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

The square root of 11989550 is about 3462.5929590410. The cubic root of 11989550 is about 228.8763721890.

The spelling of 11989550 in words is "eleven million, nine hundred eighty-nine thousand, five hundred fifty".