42646 has 4 divisors (see below), whose sum is σ = 63972. Its totient is φ = 21322.

The previous prime is 42643. The next prime is 42649. The reversal of 42646 is 64624.

42646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42643) and next prime (42649).

It is a nialpdrome in base 9 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660 + ... + 10663.

It is an arithmetic number, because the mean of its divisors is an integer number (15993).

2⁴²⁶⁴⁶ is an apocalyptic number.

42646 is a deficient number, since it is larger than the sum of its proper divisors (21326).

42646 is a wasteful number, since it uses less digits than its factorization.

42646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21325.

The product of its digits is 1152, while the sum is 22.

The square root of 42646 is about 206.5090797035. The cubic root of 42646 is about 34.9375758044.

Subtracting from 42646 its sum of digits (22), we obtain a palindrome (42624).

The spelling of 42646 in words is "forty-two thousand, six hundred forty-six".