1285000 has 40 divisors (see below), whose sum is σ = 3022470. Its totient is φ = 512000.

The previous prime is 1284991. The next prime is 1285021. The reversal of 1285000 is 5821.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 232324 + 1052676 = 482^2 + 1026^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4872 + ... + 5128.

2^1285000 is an apocalyptic number.

1285000 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 1285000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1511235).

1285000 is an abundant number, since it is smaller than the sum of its proper divisors (1737470).

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

1285000 is an equidigital number, since it uses as much as digits as its factorization.

1285000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1285000 is about 1133.5784048755. The cubic root of 1285000 is about 108.7178968966.

It can be divided in two parts, 128 and 5000, that multiplied together give a square (640000 = 800²).

The spelling of 1285000 in words is "one million, two hundred eighty-five thousand".