1240320765 has 16 divisors (see below), whose sum is σ = 2101249728. Its totient is φ = 622592256.

The previous prime is 1240320761. The next prime is 1240320773. The reversal of 1240320765 is 5670230421.

It is not a de Polignac number, because 1240320765 - 2² = 1240320761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240320761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2431747 + ... + 2432256.

It is an arithmetic number, because the mean of its divisors is an integer number (131328108).

Almost surely, 2^1240320765 is an apocalyptic number.

1240320765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1240320765 is a deficient number, since it is larger than the sum of its proper divisors (860928963).

1240320765 is a wasteful number, since it uses less digits than its factorization.

1240320765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4864028.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 1240320765 is about 35218.1879857553. The cubic root of 1240320765 is about 1074.4297000266.

The spelling of 1240320765 in words is "one billion, two hundred forty million, three hundred twenty thousand, seven hundred sixty-five".