1281686340 has 96 divisors (see below), whose sum is σ = 3936965760. Its totient is φ = 308966400.

The previous prime is 1281686303. The next prime is 1281686347. The reversal of 1281686340 is 436861821.

It is not an unprimeable number, because it can be changed into a prime (1281686347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114096 + ... + 124824.

It is an arithmetic number, because the mean of its divisors is an integer number (41010060).

Almost surely, 2^1281686340 is an apocalyptic number.

1281686340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281686340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1968482880).

1281686340 is an abundant number, since it is smaller than the sum of its proper divisors (2655279420).

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

1281686340 is a wasteful number, since it uses less digits than its factorization.

1281686340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10933 (or 10931 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 1281686340 is about 35800.6472008538. The cubic root of 1281686340 is about 1086.2436531265.

The spelling of 1281686340 in words is "one billion, two hundred eighty-one million, six hundred eighty-six thousand, three hundred forty".