1157742785 has 8 divisors (see below), whose sum is σ = 1437198120. Its totient is φ = 894256384.

The previous prime is 1157742779. The next prime is 1157742787. The reversal of 1157742785 is 5872477511.

It can be written as a sum of positive squares in 4 ways, for example, as 71842576 + 1085900209 = 8476^2 + 32953^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1157742785 - 2¹⁸ = 1157480641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1157742787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3992072 + ... + 3992361.

It is an arithmetic number, because the mean of its divisors is an integer number (179649765).

Almost surely, 2^1157742785 is an apocalyptic number.

It is an amenable number.

1157742785 is a deficient number, since it is larger than the sum of its proper divisors (279455335).

1157742785 is an equidigital number, since it uses as much as digits as its factorization.

1157742785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7984467.

The product of its digits is 548800, while the sum is 47.

The square root of 1157742785 is about 34025.6195388122. The cubic root of 1157742785 is about 1050.0356102813.

The spelling of 1157742785 in words is "one billion, one hundred fifty-seven million, seven hundred forty-two thousand, seven hundred eighty-five".