1281085338 has 16 divisors (see below), whose sum is σ = 2759260896. Its totient is φ = 394180080.

The previous prime is 1281085319. The next prime is 1281085363. The reversal of 1281085338 is 8335801821.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 1281085296 and 1281085305.

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, 8212008 + ... + 8212163.

It is an arithmetic number, because the mean of its divisors is an integer number (172453806).

Almost surely, 2^1281085338 is an apocalyptic number.

1281085338 is an abundant number, since it is smaller than the sum of its proper divisors (1478175558).

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

1281085338 is a wasteful number, since it uses less digits than its factorization.

1281085338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16424189.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 1281085338 is about 35792.2524856986. The cubic root of 1281085338 is about 1086.0738412530.

The spelling of 1281085338 in words is "one billion, two hundred eighty-one million, eighty-five thousand, three hundred thirty-eight".