1285620 has 48 divisors (see below), whose sum is σ = 4115328. Its totient is φ = 293760.

The previous prime is 1285619. The next prime is 1285633. The reversal of 1285620 is 265821.

Added to its reverse (265821) it gives a triangular number (1551441 = T₁₇₆₁).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1111 + ... + 1950.

It is an arithmetic number, because the mean of its divisors is an integer number (85736).

2^1285620 is an apocalyptic number.

1285620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285620 is an abundant number, since it is smaller than the sum of its proper divisors (2829708).

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

1285620 is a wasteful number, since it uses less digits than its factorization.

1285620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080 (or 3078 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1285620 is about 1133.8518421734. The cubic root of 1285620 is about 108.7353791944.

Adding to 1285620 its reverse (265821), we get a triangular number (1551441 = T₁₇₆₁).

The spelling of 1285620 in words is "one million, two hundred eighty-five thousand, six hundred twenty".