1263856902 has 64 divisors (see below), whose sum is σ = 3215808000. Its totient is φ = 328268640.

The previous prime is 1263856897. The next prime is 1263856907. The reversal of 1263856902 is 2096583621.

It is an interprime number because it is at equal distance from previous prime (1263856897) and next prime (1263856907).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263856907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5277 + ... + 50552.

It is an arithmetic number, because the mean of its divisors is an integer number (50247000).

Almost surely, 2^1263856902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1263856902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1607904000).

1263856902 is an abundant number, since it is smaller than the sum of its proper divisors (1951951098).

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

1263856902 is a wasteful number, since it uses less digits than its factorization.

1263856902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55866 (or 55852 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 1263856902 is about 35550.7651394453. The cubic root of 1263856902 is about 1081.1832316595.

The spelling of 1263856902 in words is "one billion, two hundred sixty-three million, eight hundred fifty-six thousand, nine hundred two".