1286159172 has 96 divisors (see below), whose sum is σ = 3353011200. Its totient is φ = 381820032.

The previous prime is 1286159167. The next prime is 1286159201. The reversal of 1286159172 is 2719516821.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307318 + ... + 311474.

It is an arithmetic number, because the mean of its divisors is an integer number (34927200).

Almost surely, 2^1286159172 is an apocalyptic number.

1286159172 is a gapful number since it is divisible by the number (12) 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 1286159172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1676505600).

1286159172 is an abundant number, since it is smaller than the sum of its proper divisors (2066852028).

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

1286159172 is a wasteful number, since it uses less digits than its factorization.

1286159172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4265 (or 4263 counting only the distinct ones).

The product of its digits is 60480, while the sum is 42.

The square root of 1286159172 is about 35863.0613863345. The cubic root of 1286159172 is about 1087.5057779585.

The spelling of 1286159172 in words is "one billion, two hundred eighty-six million, one hundred fifty-nine thousand, one hundred seventy-two".