11955640 has 32 divisors (see below), whose sum is σ = 27028080. Its totient is φ = 4759552.

The previous prime is 11955599. The next prime is 11955649. The reversal of 11955640 is 4655911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11955649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9699 + ... + 10861.

Almost surely, 2^11955640 is an apocalyptic number.

11955640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11955640 is an abundant number, since it is smaller than the sum of its proper divisors (15072440).

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

11955640 is a wasteful number, since it uses less digits than its factorization.

11955640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431 (or 1427 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 11955640 is about 3457.6928724223. The cubic root of 11955640 is about 228.6603917091.

The spelling of 11955640 in words is "eleven million, nine hundred fifty-five thousand, six hundred forty".