1140640 has 24 divisors (see below), whose sum is σ = 2695140. Its totient is φ = 456192.

The previous prime is 1140637. The next prime is 1140677. The reversal of 1140640 is 460411.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1140624 + 16 = 1068^2 + 4^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 3405 + ... + 3724.

2^1140640 is an apocalyptic number.

1140640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1140640 is an abundant number, since it is smaller than the sum of its proper divisors (1554500).

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

1140640 is an equidigital number, since it uses as much as digits as its factorization.

1140640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144 (or 7136 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1140640 is about 1068.0074906104. The cubic root of 1140640 is about 104.4839379173.

Subtracting from 1140640 its sum of digits (16), we obtain a square (1140624 = 1068²).

The spelling of 1140640 in words is "one million, one hundred forty thousand, six hundred forty".