1285995500 has 48 divisors (see below), whose sum is σ = 2825038944. Its totient is φ = 511390400.

The previous prime is 1285995497. The next prime is 1285995547. The reversal of 1285995500 is 55995821.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79067 + ... + 93933.

It is an arithmetic number, because the mean of its divisors is an integer number (58854978).

Almost surely, 2^1285995500 is an apocalyptic number.

1285995500 is a gapful number since it is divisible by the number (10) 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 1285995500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1412519472).

1285995500 is an abundant number, since it is smaller than the sum of its proper divisors (1539043444).

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

1285995500 is a wasteful number, since it uses less digits than its factorization.

1285995500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15059 (or 15047 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 44.

The square root of 1285995500 is about 35860.7794114963. The cubic root of 1285995500 is about 1087.4596453075.

The spelling of 1285995500 in words is "one billion, two hundred eighty-five million, nine hundred ninety-five thousand, five hundred".