1240340645 has 8 divisors (see below), whose sum is σ = 1488633720. Its totient is φ = 992122560.

The previous prime is 1240340639. The next prime is 1240340671. The reversal of 1240340645 is 5460430421.

It can be written as a sum of positive squares in 4 ways, for example, as 116683204 + 1123657441 = 10802^2 + 33521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1240340645 - 2²² = 1236146341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28451 + ... + 57359.

It is an arithmetic number, because the mean of its divisors is an integer number (186079215).

Almost surely, 2^1240340645 is an apocalyptic number.

It is an amenable number.

1240340645 is a deficient number, since it is larger than the sum of its proper divisors (248293075).

1240340645 is an equidigital number, since it uses as much as digits as its factorization.

1240340645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37495.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 1240340645 is about 35218.4702251532. The cubic root of 1240340645 is about 1074.4354403558.

The spelling of 1240340645 in words is "one billion, two hundred forty million, three hundred forty thousand, six hundred forty-five".