145657 has 4 divisors (see below), whose sum is σ = 147060. Its totient is φ = 144256.

The previous prime is 145643. The next prime is 145661. The reversal of 145657 is 756541.

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 50176 + 95481 = 224^2 + 309^2 .

It is a cyclic number.

It is not a de Polignac number, because 145657 - 2¹¹ = 143609 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145637) 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, 532 + ... + 757.

It is an arithmetic number, because the mean of its divisors is an integer number (36765).

2¹⁴⁵⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

145657 is a deficient number, since it is larger than the sum of its proper divisors (1403).

145657 is a wasteful number, since it uses less digits than its factorization.

145657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402.

The product of its digits is 4200, while the sum is 28.

The square root of 145657 is about 381.6503635528. The cubic root of 145657 is about 52.6151064766.

It can be divided in two parts, 14 and 5657, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 145657 in words is "one hundred forty-five thousand, six hundred fifty-seven".