263426 has 4 divisors (see below), whose sum is σ = 395142. Its totient is φ = 131712.

The previous prime is 263423. The next prime is 263429. The reversal of 263426 is 624362.

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 (263423) and next prime (263429).

It can be written as a sum of positive squares in only one way, i.e., 203401 + 60025 = 451^2 + 245^2 .

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (263423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65855 + ... + 65858.

2²⁶³⁴²⁶ is an apocalyptic number.

263426 is a deficient number, since it is larger than the sum of its proper divisors (131716).

263426 is a wasteful number, since it uses less digits than its factorization.

263426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131715.

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

The square root of 263426 is about 513.2504262054. The cubic root of 263426 is about 64.1041598153.

Adding to 263426 its reverse (624362), we get a palindrome (887788).

The spelling of 263426 in words is "two hundred sixty-three thousand, four hundred twenty-six".