11399640 has 128 divisors (see below), whose sum is σ = 40158720. Its totient is φ = 2534400.

The previous prime is 11399629. The next prime is 11399657. The reversal of 11399640 is 4699311.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34275 + ... + 34605.

It is an arithmetic number, because the mean of its divisors is an integer number (313740).

Almost surely, 2^11399640 is an apocalyptic number.

11399640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11399640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20079360).

11399640 is an abundant number, since it is smaller than the sum of its proper divisors (28759080).

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

11399640 is a wasteful number, since it uses less digits than its factorization.

11399640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 11399640 is about 3376.3352914069. The cubic root of 11399640 is about 225.0593423721.

The spelling of 11399640 in words is "eleven million, three hundred ninety-nine thousand, six hundred forty".