157405 has 4 divisors (see below), whose sum is σ = 188892. Its totient is φ = 125920.

The previous prime is 157393. The next prime is 157411. The reversal of 157405 is 504751.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29241 + 128164 = 171^2 + 358^2 .

It is not a de Polignac number, because 157405 - 2⁷ = 157277 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

157405 is a lucky number.

It is a plaindrome in base 16.

It is a nialpdrome in base 12.

It is a zygodrome in base 12.

It is a congruent number.

It is an unprimeable number.

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, 15736 + ... + 15745.

It is an arithmetic number, because the mean of its divisors is an integer number (47223).

2¹⁵⁷⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

157405 is a deficient number, since it is larger than the sum of its proper divisors (31487).

157405 is an equidigital number, since it uses as much as digits as its factorization.

157405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31486.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 157405 is about 396.7429898562. The cubic root of 157405 is about 53.9932547588.

The spelling of 157405 in words is "one hundred fifty-seven thousand, four hundred five".