263805240 has 32 divisors (see below), whose sum is σ = 791416080. Its totient is φ = 70348032.

The previous prime is 263805229. The next prime is 263805251. The reversal of 263805240 is 42508362.

It is an interprime number because it is at equal distance from previous prime (263805229) and next prime (263805251).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 263805198 and 263805207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1099069 + ... + 1099308.

Almost surely, 2^263805240 is an apocalyptic number.

263805240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263805240 is an abundant number, since it is smaller than the sum of its proper divisors (527610840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

263805240 is a wasteful number, since it uses less digits than its factorization.

263805240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198391 (or 2198387 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 263805240 is about 16242.0823788085. The cubic root of 263805240 is about 641.3490748203.

The spelling of 263805240 in words is "two hundred sixty-three million, eight hundred five thousand, two hundred forty".