1156640 has 24 divisors (see below), whose sum is σ = 2732940. Its totient is φ = 462592.

The previous prime is 1156637. The next prime is 1156643. The reversal of 1156640 is 466511.

It is an interprime number because it is at equal distance from previous prime (1156637) and next prime (1156643).

It can be written as a sum of positive squares in 2 ways, for example, as 1056784 + 99856 = 1028^2 + 316^2 .

It is not an unprimeable number, because it can be changed into a prime (1156643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3455 + ... + 3774.

2^1156640 is an apocalyptic number.

1156640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1156640 is an abundant number, since it is smaller than the sum of its proper divisors (1576300).

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

1156640 is an equidigital number, since it uses as much as digits as its factorization.

1156640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7244 (or 7236 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1156640 is about 1075.4719894074. The cubic root of 1156640 is about 104.9702107482.

The spelling of 1156640 in words is "one million, one hundred fifty-six thousand, six hundred forty".