11985890 has 48 divisors (see below), whose sum is σ = 25572024. Its totient is φ = 4032000.

The previous prime is 11985889. The next prime is 11985907. The reversal of 11985890 is 9858911.

It can be written as a sum of positive squares in 4 ways, for example, as 9966649 + 2019241 = 3157^2 + 1421^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29690 + ... + 30090.

Almost surely, 2^11985890 is an apocalyptic number.

11985890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11985890 is an abundant number, since it is smaller than the sum of its proper divisors (13586134).

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

11985890 is a wasteful number, since it uses less digits than its factorization.

11985890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 11985890 is about 3462.0644130345. The cubic root of 11985890 is about 228.8530804398.

It can be divided in two parts, 1 and 1985890, that added together give a palindrome (1985891).

The spelling of 11985890 in words is "eleven million, nine hundred eighty-five thousand, eight hundred ninety".