263673421 has 8 divisors (see below), whose sum is σ = 288149184. Its totient is φ = 239281920.

The previous prime is 263673401. The next prime is 263673457. The reversal of 263673421 is 124376362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 263673421 - 2¹³ = 263665229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263673401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14425 + ... + 27118.

It is an arithmetic number, because the mean of its divisors is an integer number (36018648).

Almost surely, 2^263673421 is an apocalyptic number.

It is an amenable number.

263673421 is a deficient number, since it is larger than the sum of its proper divisors (24475763).

263673421 is a wasteful number, since it uses less digits than its factorization.

263673421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42131.

The product of its digits is 36288, while the sum is 34.

The square root of 263673421 is about 16238.0239253426. The cubic root of 263673421 is about 641.2422332743.

The spelling of 263673421 in words is "two hundred sixty-three million, six hundred seventy-three thousand, four hundred twenty-one".