140257 has 4 divisors (see below), whose sum is σ = 151060. Its totient is φ = 129456.

The previous prime is 140249. The next prime is 140263. The reversal of 140257 is 752041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752041 = 97 ⋅7753.

It can be written as a sum of positive squares in 2 ways, for example, as 40401 + 99856 = 201^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 140257 - 2³ = 140249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140207) 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, 5382 + ... + 5407.

It is an arithmetic number, because the mean of its divisors is an integer number (37765).

2¹⁴⁰²⁵⁷ is an apocalyptic number.

It is an amenable number.

140257 is a deficient number, since it is larger than the sum of its proper divisors (10803).

140257 is a wasteful number, since it uses less digits than its factorization.

140257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10802.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 140257 is about 374.5090119076. The cubic root of 140257 is about 51.9566947149.

Adding to 140257 its reverse (752041), we get a palindrome (892298).

The spelling of 140257 in words is "one hundred forty thousand, two hundred fifty-seven".