245638 has 4 divisors (see below), whose sum is σ = 368460. Its totient is φ = 122818.

The previous prime is 245629. The next prime is 245639. The reversal of 245638 is 836542.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61408 + ... + 61411.

It is an arithmetic number, because the mean of its divisors is an integer number (92115).

2²⁴⁵⁶³⁸ is an apocalyptic number.

245638 is a deficient number, since it is larger than the sum of its proper divisors (122822).

245638 is a wasteful number, since it uses less digits than its factorization.

245638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122821.

The product of its digits is 5760, while the sum is 28.

The square root of 245638 is about 495.6188051315. The cubic root of 245638 is about 62.6275156592.

The spelling of 245638 in words is "two hundred forty-five thousand, six hundred thirty-eight".