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23457 = 371117
BaseRepresentation
bin101101110100001
31012011210
411232201
51222312
6300333
7125250
oct55641
935153
1023457
1116695
12116a9
13a8a5
148797
156e3c
hex5ba1

23457 has 8 divisors (see below), whose sum is σ = 35776. Its totient is φ = 13392.

The previous prime is 23447. The next prime is 23459. The reversal of 23457 is 75432.

Subtracting from 23457 its sum of digits (21), we obtain a triangular number (23436 = T216).

Adding to 23457 its reverse (75432), we get a palindrome (98889).

It is a happy number.

23457 is nontrivially palindromic in base 9.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23457 - 28 = 23201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1117 = 23457 / (2 + 3 + 4 + 5 + 7).

It is a Duffinian number.

23457 is a lucky number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538 + ... + 579.

It is an arithmetic number, because the mean of its divisors is an integer number (4472).

223457 is an apocalyptic number.

It is an amenable number.

23457 is a deficient number, since it is larger than the sum of its proper divisors (12319).

23457 is a wasteful number, since it uses less digits than its factorization.

23457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127.

The product of its digits is 840, while the sum is 21.

The square root of 23457 is about 153.1567824159. The cubic root of 23457 is about 28.6257905492.

The spelling of 23457 in words is "twenty-three thousand, four hundred fifty-seven".

Divisors: 1 3 7 21 1117 3351 7819 23457