1263493964 has 12 divisors (see below), whose sum is σ = 2212219464. Its totient is φ = 631431264.

The previous prime is 1263493963. The next prime is 1263493981. The reversal of 1263493964 is 4693943621.

It is not an unprimeable number, because it can be changed into a prime (1263493961) 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, 69809 + ... + 86024.

It is an arithmetic number, because the mean of its divisors is an integer number (184351622).

Almost surely, 2^1263493964 is an apocalyptic number.

It is an amenable number.

1263493964 is a deficient number, since it is larger than the sum of its proper divisors (948725500).

1263493964 is a wasteful number, since it uses less digits than its factorization.

1263493964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157864 (or 157862 counting only the distinct ones).

The product of its digits is 839808, while the sum is 47.

The square root of 1263493964 is about 35545.6602695744. The cubic root of 1263493964 is about 1081.0797283682.

The spelling of 1263493964 in words is "one billion, two hundred sixty-three million, four hundred ninety-three thousand, nine hundred sixty-four".