1285996520 has 16 divisors (see below), whose sum is σ = 2893492260. Its totient is φ = 514398592.

The previous prime is 1285996519. The next prime is 1285996553. The reversal of 1285996520 is 256995821.

It can be written as a sum of positive squares in 2 ways, for example, as 1285509316 + 487204 = 35854^2 + 698^2 .

It is a super-2 number, since 2×1285996520² = 3307574098904220800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16074917 + ... + 16074996.

Almost surely, 2^1285996520 is an apocalyptic number.

1285996520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285996520 is an abundant number, since it is smaller than the sum of its proper divisors (1607495740).

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

1285996520 is a wasteful number, since it uses less digits than its factorization.

1285996520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32149924 (or 32149920 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 1285996520 is about 35860.7936331588. The cubic root of 1285996520 is about 1087.4599328172.

The spelling of 1285996520 in words is "one billion, two hundred eighty-five million, nine hundred ninety-six thousand, five hundred twenty".