11800640 has 28 divisors (see below), whose sum is σ = 28101036. Its totient is φ = 4720128.

The previous prime is 11800639. The next prime is 11800673. The reversal of 11800640 is 4600811.

It can be written as a sum of positive squares in 2 ways, for example, as 7573504 + 4227136 = 2752^2 + 2056^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18119 + ... + 18758.

Almost surely, 2^11800640 is an apocalyptic number.

11800640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11800640 is an abundant number, since it is smaller than the sum of its proper divisors (16300396).

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

11800640 is an equidigital number, since it uses as much as digits as its factorization.

11800640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36894 (or 36884 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 11800640 is about 3435.2059618020. The cubic root of 11800640 is about 227.6679273778.

The spelling of 11800640 in words is "eleven million, eight hundred thousand, six hundred forty".