11639640 has 32 divisors (see below), whose sum is σ = 34919280. Its totient is φ = 3103872.

The previous prime is 11639603. The next prime is 11639659. The reversal of 11639640 is 4693611.

11639640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 11639598 and 11639607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48379 + ... + 48618.

Almost surely, 2^11639640 is an apocalyptic number.

11639640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11639640 is an abundant number, since it is smaller than the sum of its proper divisors (23279640).

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

11639640 is a wasteful number, since it uses less digits than its factorization.

11639640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97011 (or 97007 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 11639640 is about 3411.6916625041. The cubic root of 11639640 is about 226.6277999487.

The spelling of 11639640 in words is "eleven million, six hundred thirty-nine thousand, six hundred forty".