1263938894 has 4 divisors (see below), whose sum is σ = 1895908344. Its totient is φ = 631969446.

The previous prime is 1263938867. The next prime is 1263938909. The reversal of 1263938894 is 4988393621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4988393621 = 64063 ⋅77867.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315984722 + ... + 315984725.

It is an arithmetic number, because the mean of its divisors is an integer number (473977086).

Almost surely, 2^1263938894 is an apocalyptic number.

1263938894 is a deficient number, since it is larger than the sum of its proper divisors (631969450).

1263938894 is an equidigital number, since it uses as much as digits as its factorization.

1263938894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631969449.

The product of its digits is 2239488, while the sum is 53.

The square root of 1263938894 is about 35551.9182886100. The cubic root of 1263938894 is about 1081.2066115370.

The spelling of 1263938894 in words is "one billion, two hundred sixty-three million, nine hundred thirty-eight thousand, eight hundred ninety-four".