1281826338 has 16 divisors (see below), whose sum is σ = 2760856896. Its totient is φ = 394408080.

The previous prime is 1281826319. The next prime is 1281826349. The reversal of 1281826338 is 8336281821.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1281826338.

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, 8216758 + ... + 8216913.

It is an arithmetic number, because the mean of its divisors is an integer number (172553556).

Almost surely, 2^1281826338 is an apocalyptic number.

1281826338 is an abundant number, since it is smaller than the sum of its proper divisors (1479030558).

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

1281826338 is a wasteful number, since it uses less digits than its factorization.

1281826338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16433689.

The product of its digits is 110592, while the sum is 42.

The square root of 1281826338 is about 35802.6023914464. The cubic root of 1281826338 is about 1086.2832016488.

The spelling of 1281826338 in words is "one billion, two hundred eighty-one million, eight hundred twenty-six thousand, three hundred thirty-eight".