11389640 has 16 divisors (see below), whose sum is σ = 25626780. Its totient is φ = 4555840.

The previous prime is 11389639. The next prime is 11389649. The reversal of 11389640 is 4698311.

It is a happy number.

11389640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10982596 + 407044 = 3314^2 + 638^2 .

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11389597 and 11389606.

It is not an unprimeable number, because it can be changed into a prime (11389649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142331 + ... + 142410.

Almost surely, 2^11389640 is an apocalyptic number.

11389640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11389640 is an abundant number, since it is smaller than the sum of its proper divisors (14237140).

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

11389640 is a wasteful number, since it uses less digits than its factorization.

11389640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284752 (or 284748 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 11389640 is about 3374.8540709192. The cubic root of 11389640 is about 224.9935142163.

The spelling of 11389640 in words is "eleven million, three hundred eighty-nine thousand, six hundred forty".