157309 has 4 divisors (see below), whose sum is σ = 160704. Its totient is φ = 153916.

The previous prime is 157307. The next prime is 157321. The reversal of 157309 is 903751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 157309 - 2¹ = 157307 is a prime.

It is a super-2 number, since 2×157309² = 49492242962, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1627 + ... + 1720.

It is an arithmetic number, because the mean of its divisors is an integer number (40176).

2¹⁵⁷³⁰⁹ is an apocalyptic number.

It is an amenable number.

157309 is a deficient number, since it is larger than the sum of its proper divisors (3395).

157309 is an equidigital number, since it uses as much as digits as its factorization.

157309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394.

The product of its (nonzero) digits is 945, while the sum is 25.

The square root of 157309 is about 396.6219862791. The cubic root of 157309 is about 53.9822758475.

The spelling of 157309 in words is "one hundred fifty-seven thousand, three hundred nine".