1263790940 has 12 divisors (see below), whose sum is σ = 2653961016. Its totient is φ = 505516368.

The previous prime is 1263790939. The next prime is 1263790949. The reversal of 1263790940 is 490973621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263790949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31594754 + ... + 31594793.

It is an arithmetic number, because the mean of its divisors is an integer number (221163418).

Almost surely, 2^1263790940 is an apocalyptic number.

1263790940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263790940 is an abundant number, since it is smaller than the sum of its proper divisors (1390170076).

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

1263790940 is a wasteful number, since it uses less digits than its factorization.

1263790940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63189556 (or 63189554 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 1263790940 is about 35549.8374117238. The cubic root of 1263790940 is about 1081.1644219749.

The spelling of 1263790940 in words is "one billion, two hundred sixty-three million, seven hundred ninety thousand, nine hundred forty".