11531640 has 32 divisors (see below), whose sum is σ = 34595280. Its totient is φ = 3075072.

The previous prime is 11531621. The next prime is 11531669. The reversal of 11531640 is 4613511.

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, 47929 + ... + 48168.

Almost surely, 2^11531640 is an apocalyptic number.

11531640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11531640 is an abundant number, since it is smaller than the sum of its proper divisors (23063640).

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

11531640 is a wasteful number, since it uses less digits than its factorization.

11531640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96111 (or 96107 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 11531640 is about 3395.8268507096. The cubic root of 11531640 is about 225.9246884050.

The spelling of 11531640 in words is "eleven million, five hundred thirty-one thousand, six hundred forty".