423634 has 4 divisors (see below), whose sum is σ = 635454. Its totient is φ = 211816.

The previous prime is 423617. The next prime is 423649. The reversal of 423634 is 436324.

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

It can be written as a sum of positive squares in only one way, i.e., 363609 + 60025 = 603^2 + 245^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 4⁵ + 2¹³ + 6⁷ + 3¹⁰ + 3¹⁰ + 4⁷ .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105907 + ... + 105910.

2⁴²³⁶³⁴ is an apocalyptic number.

423634 is a deficient number, since it is larger than the sum of its proper divisors (211820).

423634 is a wasteful number, since it uses less digits than its factorization.

423634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211819.

The product of its digits is 1728, while the sum is 22.

The square root of 423634 is about 650.8717231529. The cubic root of 423634 is about 75.1040925002.

Adding to 423634 its reverse (436324), we get a palindrome (859958).

It can be divided in two parts, 42 and 3634, that multiplied together give a triangular number (152628 = T₅₅₂).

The spelling of 423634 in words is "four hundred twenty-three thousand, six hundred thirty-four".