1240556791 has 16 divisors (see below), whose sum is σ = 1309342720. Its totient is φ = 1173839040.

The previous prime is 1240556789. The next prime is 1240556851. The reversal of 1240556791 is 1976550421.

It is a cyclic number.

It is not a de Polignac number, because 1240556791 - 2¹ = 1240556789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240556591) 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, 286555 + ... + 290851.

It is an arithmetic number, because the mean of its divisors is an integer number (81833920).

Almost surely, 2^1240556791 is an apocalyptic number.

1240556791 is a deficient number, since it is larger than the sum of its proper divisors (68785929).

1240556791 is a wasteful number, since it uses less digits than its factorization.

1240556791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4534.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 1240556791 is about 35221.5387369717. The cubic root of 1240556791 is about 1074.4978483281.

It can be divided in two parts, 12405 and 56791, that added together give a palindrome (69196).

The spelling of 1240556791 in words is "one billion, two hundred forty million, five hundred fifty-six thousand, seven hundred ninety-one".