1280159857 has 8 divisors (see below), whose sum is σ = 1357281792. Its totient is φ = 1203240000.

The previous prime is 1280159843. The next prime is 1280159861. The reversal of 1280159857 is 7589510821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1280159857 - 2¹⁹ = 1279635569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280159887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37369 + ... + 62902.

It is an arithmetic number, because the mean of its divisors is an integer number (169660224).

Almost surely, 2^1280159857 is an apocalyptic number.

1280159857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1280159857 is a deficient number, since it is larger than the sum of its proper divisors (77121935).

1280159857 is a wasteful number, since it uses less digits than its factorization.

1280159857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101039.

The product of its (nonzero) digits is 201600, while the sum is 46.

The square root of 1280159857 is about 35779.3216397405. The cubic root of 1280159857 is about 1085.8122446165.

The spelling of 1280159857 in words is "one billion, two hundred eighty million, one hundred fifty-nine thousand, eight hundred fifty-seven".