156397 has 4 divisors (see below), whose sum is σ = 161820. Its totient is φ = 150976.

The previous prime is 156371. The next prime is 156419. The reversal of 156397 is 793651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793651 = 43 ⋅18457.

It can be written as a sum of positive squares in 2 ways, for example, as 121801 + 34596 = 349^2 + 186^2 .

It is a cyclic number.

It is not a de Polignac number, because 156397 - 2⁷ = 156269 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

156397 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2668 + ... + 2725.

It is an arithmetic number, because the mean of its divisors is an integer number (40455).

2¹⁵⁶³⁹⁷ is an apocalyptic number.

It is an amenable number.

156397 is a deficient number, since it is larger than the sum of its proper divisors (5423).

156397 is an equidigital number, since it uses as much as digits as its factorization.

156397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5422.

The product of its digits is 5670, while the sum is 31.

The square root of 156397 is about 395.4706057345. The cubic root of 156397 is about 53.8777527246.

The spelling of 156397 in words is "one hundred fifty-six thousand, three hundred ninety-seven".