263990 has 8 divisors (see below), whose sum is σ = 475200. Its totient is φ = 105592.

The previous prime is 263983. The next prime is 264007. The reversal of 263990 is 99362.

263990 is nontrivially palindromic in base 14.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

263990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13190 + ... + 13209.

It is an arithmetic number, because the mean of its divisors is an integer number (59400).

2²⁶³⁹⁹⁰ is an apocalyptic number.

263990 is a deficient number, since it is larger than the sum of its proper divisors (211210).

263990 is a wasteful number, since it uses less digits than its factorization.

263990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26406.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 263990 is about 513.7995718176. The cubic root of 263990 is about 64.1498766063.

It can be divided in two parts, 26 and 3990, that multiplied together give a triangular number (103740 = T₄₅₅).

The spelling of 263990 in words is "two hundred sixty-three thousand, nine hundred ninety".