1281957696 has 42 divisors (see below), whose sum is σ = 3674501922. Its totient is φ = 427319040.

The previous prime is 1281957689. The next prime is 1281957697. The reversal of 1281957696 is 6967591821.

It can be written as a sum of positive squares in only one way, i.e., 810199296 + 471758400 = 28464^2 + 21720^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281957697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112235 + ... + 1113386.

It is an arithmetic number, because the mean of its divisors is an integer number (87488141).

Almost surely, 2^1281957696 is an apocalyptic number.

1281957696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1281957696 is an abundant number, since it is smaller than the sum of its proper divisors (2392544226).

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

1281957696 is a wasteful number, since it uses less digits than its factorization.

1281957696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225639 (or 2225626 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 1281957696 is about 35804.4368200367. The cubic root of 1281957696 is about 1086.3203068090.

The spelling of 1281957696 in words is "one billion, two hundred eighty-one million, nine hundred fifty-seven thousand, six hundred ninety-six".