247638 has 16 divisors (see below), whose sum is σ = 500400. Its totient is φ = 81696.

The previous prime is 247633. The next prime is 247649. The reversal of 247638 is 836742.

247638 is nontrivially palindromic in base 14.

It is a super-2 number, since 2×247638² = 122649158088, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 247638.

It is not an unprimeable number, because it can be changed into a prime (247633) by changing a digit.

247638 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 756 + ... + 1032.

It is an arithmetic number, because the mean of its divisors is an integer number (31275).

2²⁴⁷⁶³⁸ is an apocalyptic number.

247638 is an abundant number, since it is smaller than the sum of its proper divisors (252762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247638 is a wasteful number, since it uses less digits than its factorization.

247638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431.

The product of its digits is 8064, while the sum is 30.

The square root of 247638 is about 497.6323944439. The cubic root of 247638 is about 62.7970288126.

The spelling of 247638 in words is "two hundred forty-seven thousand, six hundred thirty-eight".