1285813965 has 32 divisors (see below), whose sum is σ = 2148975360. Its totient is φ = 655271936.

The previous prime is 1285813957. The next prime is 1285813967. The reversal of 1285813965 is 5693185821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1285813965 - 2³ = 1285813957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285813967) 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, 650719 + ... + 652691.

It is an arithmetic number, because the mean of its divisors is an integer number (67155480).

Almost surely, 2^1285813965 is an apocalyptic number.

1285813965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1285813965 is a deficient number, since it is larger than the sum of its proper divisors (863161395).

1285813965 is a wasteful number, since it uses less digits than its factorization.

1285813965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3893.

The product of its digits is 518400, while the sum is 48.

The square root of 1285813965 is about 35858.2482143230. The cubic root of 1285813965 is about 1087.4084732061.

The spelling of 1285813965 in words is "one billion, two hundred eighty-five million, eight hundred thirteen thousand, nine hundred sixty-five".