157447 has 4 divisors (see below), whose sum is σ = 159520. Its totient is φ = 155376.

The previous prime is 157433. The next prime is 157457. The reversal of 157447 is 744751.

157447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 157447 - 2¹¹ = 155399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157427) 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, 918 + ... + 1075.

It is an arithmetic number, because the mean of its divisors is an integer number (39880).

157447 is a Friedman number, since it can be written as 54^(7-4)-17, using all its digits and the basic arithmetic operations.

2¹⁵⁷⁴⁴⁷ is an apocalyptic number.

157447 is a deficient number, since it is larger than the sum of its proper divisors (2073).

157447 is an equidigital number, since it uses as much as digits as its factorization.

157447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072.

The product of its digits is 3920, while the sum is 28.

The square root of 157447 is about 396.7959173177. The cubic root of 157447 is about 53.9980566287.

It can be divided in two parts, 15744 and 7, that added together give a palindrome (15751).

The spelling of 157447 in words is "one hundred fifty-seven thousand, four hundred forty-seven".