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BaseRepresentation
bin100100100100010
3221200102
410210202
51044342
6222402
7105404
oct44442
927612
1018722
1113080
12aa02
1386a2
146b74
155832
hex4922

18722 has 16 divisors (see below), whose sum is σ = 32832. Its totient is φ = 7920.

The previous prime is 18719. The next prime is 18731. The reversal of 18722 is 22781.

It can be divided in two parts, 187 and 22, that multiplied together give a palindrome (4114).

It is a pancake number, because a pancake can be divided into 18722 parts by 193 straight cuts.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 18694 and 18703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488 + ... + 524.

It is an arithmetic number, because the mean of its divisors is an integer number (2052).

218722 is an apocalyptic number.

18722 is a deficient number, since it is larger than the sum of its proper divisors (14110).

18722 is a wasteful number, since it uses less digits than its factorization.

18722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73.

The product of its digits is 224, while the sum is 20.

The square root of 18722 is about 136.8283596335. The cubic root of 18722 is about 26.5532334459.

The spelling of 18722 in words is "eighteen thousand, seven hundred twenty-two".