1263902642 has 8 divisors (see below), whose sum is σ = 1897897500. Its totient is φ = 631270144.

The previous prime is 1263902641. The next prime is 1263902659. The reversal of 1263902642 is 2462093621.

It can be written as a sum of positive squares in 2 ways, for example, as 1119638521 + 144264121 = 33461^2 + 12011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1263902641) 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, 338267 + ... + 341982.

Almost surely, 2^1263902642 is an apocalyptic number.

1263902642 is a deficient number, since it is larger than the sum of its proper divisors (633994858).

1263902642 is an equidigital number, since it uses as much as digits as its factorization.

1263902642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681180.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 1263902642 is about 35551.4084390478. The cubic root of 1263902642 is about 1081.1962744664.

The spelling of 1263902642 in words is "one billion, two hundred sixty-three million, nine hundred two thousand, six hundred forty-two".