42436 has 9 divisors (see below), whose sum is σ = 74991. Its totient is φ = 21012.

The previous prime is 42433. The next prime is 42437. The reversal of 42436 is 63424.

42436 = T₂₀₅ + T₂₀₆.

The square root of 42436 is 206.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 361 + ... + 463.

2⁴²⁴³⁶ is an apocalyptic number.

42436 is the 206-th square number.

It is an amenable number.

42436 is a deficient number, since it is larger than the sum of its proper divisors (32555).

42436 is a wasteful number, since it uses less digits than its factorization.

42436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 105 counting only the distinct ones).

The product of its digits is 576, while the sum is 19.

The cubic root of 42436 is about 34.8801341773.

Multiplying 42436 by its product of digits (576), we get a square (24443136 = 4944²).

The spelling of 42436 in words is "forty-two thousand, four hundred thirty-six".