263890 has 16 divisors (see below), whose sum is σ = 518400. Its totient is φ = 95920.

The previous prime is 263881. The next prime is 263899. The reversal of 263890 is 98362.

It is an interprime number because it is at equal distance from previous prime (263881) and next prime (263899).

It is not an unprimeable number, because it can be changed into a prime (263899) 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 in 7 ways as a sum of consecutive naturals, for example, 1090 + ... + 1309.

It is an arithmetic number, because the mean of its divisors is an integer number (32400).

2²⁶³⁸⁹⁰ is an apocalyptic number.

263890 is a deficient number, since it is larger than the sum of its proper divisors (254510).

263890 is a wasteful number, since it uses less digits than its factorization.

263890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 263890 is about 513.7022483891. The cubic root of 263890 is about 64.1417755446.

It can be divided in two parts, 26 and 3890, that added together give a triangular number (3916 = T₈₈).

The spelling of 263890 in words is "two hundred sixty-three thousand, eight hundred ninety".