1285830 has 96 divisors (see below), whose sum is σ = 4140864. Its totient is φ = 269568.

The previous prime is 1285813. The next prime is 1285841. The reversal of 1285830 is 385821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1285794 and 1285803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8112 + ... + 8268.

It is an arithmetic number, because the mean of its divisors is an integer number (43134).

2^1285830 is an apocalyptic number.

1285830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2070432).

1285830 is an abundant number, since it is smaller than the sum of its proper divisors (2855034).

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

1285830 is a wasteful number, since it uses less digits than its factorization.

1285830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1285830 is about 1133.9444430835. The cubic root of 1285830 is about 108.7412993435.

Subtracting from 1285830 its reverse (385821), we obtain a palindrome (900009).

The spelling of 1285830 in words is "one million, two hundred eighty-five thousand, eight hundred thirty".