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42506 = 253401
BaseRepresentation
bin1010011000001010
32011022022
422120022
52330011
6524442
7234632
oct123012
964268
1042506
1129a32
1220722
1316469
14116c2
15c8db
hexa60a

42506 has 8 divisors (see below), whose sum is σ = 65124. Its totient is φ = 20800.

The previous prime is 42499. The next prime is 42509. The reversal of 42506 is 60524.

It can be written as a sum of positive squares in 2 ways, for example, as 34225 + 8281 = 185^2 + 91^2 .

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

It is not an unprimeable number, because it can be changed into a prime (42509) by changing a digit.

42506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95 + ... + 306.

242506 is an apocalyptic number.

42506 is a deficient number, since it is larger than the sum of its proper divisors (22618).

42506 is a wasteful number, since it uses less digits than its factorization.

42506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 42506 is about 206.1698329048. The cubic root of 42506 is about 34.8993024001.

The spelling of 42506 in words is "forty-two thousand, five hundred six".

Divisors: 1 2 53 106 401 802 21253 42506