1281307442 has 16 divisors (see below), whose sum is σ = 2041536312. Its totient is φ = 601036800.

The previous prime is 1281307439. The next prime is 1281307481. The reversal of 1281307442 is 2447031821.

It can be written as a sum of positive squares in 4 ways, for example, as 486687721 + 794619721 = 22061^2 + 28189^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1281307399 and 1281307408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49559 + ... + 70842.

Almost surely, 2^1281307442 is an apocalyptic number.

1281307442 is a deficient number, since it is larger than the sum of its proper divisors (760228870).

1281307442 is a wasteful number, since it uses less digits than its factorization.

1281307442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120733.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 1281307442 is about 35795.3550338588. The cubic root of 1281307442 is about 1086.1366024650.

The spelling of 1281307442 in words is "one billion, two hundred eighty-one million, three hundred seven thousand, four hundred forty-two".