1285621 has 8 divisors (see below), whose sum is σ = 1327104. Its totient is φ = 1244880.

The previous prime is 1285619. The next prime is 1285633. The reversal of 1285621 is 1265821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1285621 - 2¹ = 1285619 is a prime.

It is an Ulam number.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 6636 + ... + 6826.

It is an arithmetic number, because the mean of its divisors is an integer number (165888).

2^1285621 is an apocalyptic number.

It is an amenable number.

1285621 is a deficient number, since it is larger than the sum of its proper divisors (41483).

1285621 is a wasteful number, since it uses less digits than its factorization.

1285621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371.

The product of its digits is 960, while the sum is 25.

The square root of 1285621 is about 1133.8522831480. The cubic root of 1285621 is about 108.7354073871.

The spelling of 1285621 in words is "one million, two hundred eighty-five thousand, six hundred twenty-one".