8442739257 has 16 divisors (see below), whose sum is σ = 11921561280. Its totient is φ = 5296338432.

The previous prime is 8442739199. The next prime is 8442739267. The reversal of 8442739257 is 7529372448.

It is not a de Polignac number, because 8442739257 - 2¹¹ = 8442737209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (8442739267) 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, 296094 + ... + 323352.

It is an arithmetic number, because the mean of its divisors is an integer number (745097580).

Almost surely, 2^8442739257 is an apocalyptic number.

It is an amenable number.

8442739257 is a deficient number, since it is larger than the sum of its proper divisors (3478822023).

8442739257 is a wasteful number, since it uses less digits than its factorization.

8442739257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33352.

The product of its digits is 3386880, while the sum is 51.

The square root of 8442739257 is about 91884.3798313946. The cubic root of 8442739257 is about 2036.2345039691.

The spelling of 8442739257 in words is "eight billion, four hundred forty-two million, seven hundred thirty-nine thousand, two hundred fifty-seven".