240557 has 4 divisors (see below), whose sum is σ = 251040. Its totient is φ = 230076.

The previous prime is 240551. The next prime is 240571. The reversal of 240557 is 755042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 755042 = 2 ⋅377521.

It is a cyclic number.

It is not a de Polignac number, because 240557 - 2¹² = 236461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 10459 = 240557 / (2 + 4 + 0 + 5 + 5 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240551) 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, 5207 + ... + 5252.

It is an arithmetic number, because the mean of its divisors is an integer number (62760).

2²⁴⁰⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

240557 is a deficient number, since it is larger than the sum of its proper divisors (10483).

240557 is a wasteful number, since it uses less digits than its factorization.

240557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10482.

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 240557 is about 490.4661048431. The cubic root of 240557 is about 62.1926887668.

Adding to 240557 its reverse (755042), we get a palindrome (995599).

It can be divided in two parts, 240 and 557, that added together give a palindrome (797).

The spelling of 240557 in words is "two hundred forty thousand, five hundred fifty-seven".