1285020 has 108 divisors (see below), whose sum is σ = 4357080. Its totient is φ = 306240.

The previous prime is 1284991. The next prime is 1285021. The reversal of 1285020 is 205821.

Added to its reverse (205821) it gives a square (1490841 = 1221²).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1284984 and 1285002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21751 + ... + 21809.

2^1285020 is an apocalyptic number.

1285020 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 1285020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2178540).

1285020 is an abundant number, since it is smaller than the sum of its proper divisors (3072060).

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

1285020 is a wasteful number, since it uses less digits than its factorization.

1285020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1285020 is about 1133.5872264630. The cubic root of 1285020 is about 108.7184609294.

Adding to 1285020 its reverse (205821), we get a square (1490841 = 1221²).

The spelling of 1285020 in words is "one million, two hundred eighty-five thousand, twenty".