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21742 = 271553
BaseRepresentation
bin101010011101110
31002211021
411103232
51143432
6244354
7120250
oct52356
932737
1021742
1115376
12106ba
139b86
147cd0
156697
hex54ee

21742 has 8 divisors (see below), whose sum is σ = 37296. Its totient is φ = 9312.

The previous prime is 21739. The next prime is 21751. The reversal of 21742 is 24712.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763 + ... + 790.

It is an arithmetic number, because the mean of its divisors is an integer number (4662).

221742 is an apocalyptic number.

21742 is a deficient number, since it is larger than the sum of its proper divisors (15554).

21742 is a wasteful number, since it uses less digits than its factorization.

21742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562.

The product of its digits is 112, while the sum is 16.

The square root of 21742 is about 147.4516870029. The cubic root of 21742 is about 27.9104280508.

The spelling of 21742 in words is "twenty-one thousand, seven hundred forty-two", and thus it is an iban number.

Divisors: 1 2 7 14 1553 3106 10871 21742