623426 has 4 divisors (see below), whose sum is σ = 935142. Its totient is φ = 311712.

The previous prime is 623423. The next prime is 623431. The reversal of 623426 is 624326.

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., 600625 + 22801 = 775^2 + 151^2 .

It is not an unprimeable number, because it can be changed into a prime (623423) 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 as a sum of consecutive naturals, namely, 155855 + ... + 155858.

2⁶²³⁴²⁶ is an apocalyptic number.

623426 is a deficient number, since it is larger than the sum of its proper divisors (311716).

623426 is a wasteful number, since it uses less digits than its factorization.

623426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311715.

The product of its digits is 1728, while the sum is 23.

The square root of 623426 is about 789.5733024869. The cubic root of 623426 is about 85.4269636076.

Subtracting 623426 from its reverse (624326), we obtain a square (900 = 30²).

It can be divided in two parts, 6 and 23426, that added together give a palindrome (23432).

The spelling of 623426 in words is "six hundred twenty-three thousand, four hundred twenty-six".