11601640 has 16 divisors (see below), whose sum is σ = 26103780. Its totient is φ = 4640640.

The previous prime is 11601631. The next prime is 11601641. The reversal of 11601640 is 4610611.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9647236 + 1954404 = 3106^2 + 1398^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11601641) 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, 144981 + ... + 145060.

Almost surely, 2^11601640 is an apocalyptic number.

11601640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11601640 is an abundant number, since it is smaller than the sum of its proper divisors (14502140).

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

11601640 is a wasteful number, since it uses less digits than its factorization.

11601640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290052 (or 290048 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 11601640 is about 3406.1180249663. The cubic root of 11601640 is about 226.3809067127.

The spelling of 11601640 in words is "eleven million, six hundred one thousand, six hundred forty".