11138985 has 64 divisors (see below), whose sum is σ = 23304960. Its totient is φ = 4976640.

The previous prime is 11138983. The next prime is 11138989. The reversal of 11138985 is 58983111.

It is not a de Polignac number, because 11138985 - 2¹ = 11138983 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11138983) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19017 + ... + 19593.

It is an arithmetic number, because the mean of its divisors is an integer number (364140).

Almost surely, 2^11138985 is an apocalyptic number.

11138985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11138985 is an abundant number, since it is smaller than the sum of its proper divisors (12165975).

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

11138985 is a wasteful number, since it uses less digits than its factorization.

11138985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 609 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 11138985 is about 3337.5117977320. The cubic root of 11138985 is about 223.3307578723.

The spelling of 11138985 in words is "eleven million, one hundred thirty-eight thousand, nine hundred eighty-five".