1263780042 has 16 divisors (see below), whose sum is σ = 2888640192. Its totient is φ = 361080000.

The previous prime is 1263779999. The next prime is 1263780043. The reversal of 1263780042 is 2400873621.

It is a junction number, because it is equal to n+sod(n) for n = 1263779985 and 1263780012.

It is not an unprimeable number, because it can be changed into a prime (1263780043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15044959 + ... + 15045042.

It is an arithmetic number, because the mean of its divisors is an integer number (180540012).

Almost surely, 2^1263780042 is an apocalyptic number.

1263780042 is an abundant number, since it is smaller than the sum of its proper divisors (1624860150).

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

1263780042 is a wasteful number, since it uses less digits than its factorization.

1263780042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30090013.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 1263780042 is about 35549.6841336178. The cubic root of 1263780042 is about 1081.1613142448.

The spelling of 1263780042 in words is "one billion, two hundred sixty-three million, seven hundred eighty thousand, forty-two".