11965640 has 32 divisors (see below), whose sum is σ = 27027000. Its totient is φ = 4767744.

The previous prime is 11965627. The next prime is 11965643. The reversal of 11965640 is 4656911.

It can be written as a sum of positive squares in 4 ways, for example, as 7496644 + 4468996 = 2738^2 + 2114^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11965597 and 11965606.

It is not an unprimeable number, because it can be changed into a prime (11965643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15176 + ... + 15944.

Almost surely, 2^11965640 is an apocalyptic number.

11965640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11965640 is an abundant number, since it is smaller than the sum of its proper divisors (15061360).

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

11965640 is a wasteful number, since it uses less digits than its factorization.

11965640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 11965640 is about 3459.1386211021. The cubic root of 11965640 is about 228.7241263897.

The spelling of 11965640 in words is "eleven million, nine hundred sixty-five thousand, six hundred forty".