1157439309 has 16 divisors (see below), whose sum is σ = 1684734912. Its totient is φ = 702511488.

The previous prime is 1157439287. The next prime is 1157439331. The reversal of 1157439309 is 9039347511.

It is an interprime number because it is at equal distance from previous prime (1157439287) and next prime (1157439331).

It is not a de Polignac number, because 1157439309 - 2⁸ = 1157439053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157439379) 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, 200427 + ... + 206120.

It is an arithmetic number, because the mean of its divisors is an integer number (105295932).

Almost surely, 2^1157439309 is an apocalyptic number.

It is an amenable number.

1157439309 is a deficient number, since it is larger than the sum of its proper divisors (527295603).

1157439309 is a wasteful number, since it uses less digits than its factorization.

1157439309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406636.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 1157439309 is about 34021.1597245009. The cubic root of 1157439309 is about 1049.9438545942.

The spelling of 1157439309 in words is "one billion, one hundred fifty-seven million, four hundred thirty-nine thousand, three hundred nine".