245858 has 4 divisors (see below), whose sum is σ = 368790. Its totient is φ = 122928.

The previous prime is 245851. The next prime is 245863. The reversal of 245858 is 858542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 858542 = 2 ⋅429271.

It can be written as a sum of positive squares in only one way, i.e., 243049 + 2809 = 493^2 + 53^2 .

It is a d-powerful number, because it can be written as 2¹⁷ + 4⁴ + 8³ + 5⁵ + 5⁷ + 8⁵ .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 245858.

It is not an unprimeable number, because it can be changed into a prime (245851) by changing a digit.

245858 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61463 + ... + 61466.

2²⁴⁵⁸⁵⁸ is an apocalyptic number.

245858 is a deficient number, since it is larger than the sum of its proper divisors (122932).

245858 is a wasteful number, since it uses less digits than its factorization.

245858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122931.

The product of its digits is 12800, while the sum is 32.

The square root of 245858 is about 495.8407002254. The cubic root of 245858 is about 62.6462070426.

The spelling of 245858 in words is "two hundred forty-five thousand, eight hundred fifty-eight".