1263864 has 32 divisors (see below), whose sum is σ = 3611520. Its totient is φ = 361056.

The previous prime is 1263863. The next prime is 1263887. The reversal of 1263864 is 4683621.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263863) 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, 3594 + ... + 3929.

It is an arithmetic number, because the mean of its divisors is an integer number (112860).

2^1263864 is an apocalyptic number.

1263864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1263864 is an abundant number, since it is smaller than the sum of its proper divisors (2347656).

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

1263864 is a wasteful number, since it uses less digits than its factorization.

1263864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7539 (or 7535 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 1263864 is about 1124.2170608917. The cubic root of 1263864 is about 108.1185255682.

The spelling of 1263864 in words is "one million, two hundred sixty-three thousand, eight hundred sixty-four".