1285992 has 48 divisors (see below), whose sum is σ = 3559140. Its totient is φ = 419328.

The previous prime is 1285981. The next prime is 1285993. The reversal of 1285992 is 2995821.

It can be written as a sum of positive squares in 2 ways, for example, as 1285956 + 36 = 1134^2 + 6^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1285993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3648 + ... + 3984.

2^1285992 is an apocalyptic number.

1285992 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 1285992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1779570).

1285992 is an abundant number, since it is smaller than the sum of its proper divisors (2273148).

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

1285992 is a wasteful number, since it uses less digits than its factorization.

1285992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 395 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1285992 is about 1134.0158729048. The cubic root of 1285992 is about 108.7458658753.

Subtracting from 1285992 its sum of digits (36), we obtain a square (1285956 = 1134²).

The spelling of 1285992 in words is "one million, two hundred eighty-five thousand, nine hundred ninety-two".