1621256 has 64 divisors (see below), whose sum is σ = 3991680. Its totient is φ = 599040.

The previous prime is 1621241. The next prime is 1621259. The reversal of 1621256 is 6521261.

It is a zygodrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (1621259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12311 + ... + 12441.

It is an arithmetic number, because the mean of its divisors is an integer number (62370).

2^1621256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1995840).

1621256 is an abundant number, since it is smaller than the sum of its proper divisors (2370424).

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

1621256 is a wasteful number, since it uses less digits than its factorization.

1621256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 170 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 1621256 is about 1273.2855139363. The cubic root of 1621256 is about 117.4763737015.

The spelling of 1621256 in words is "one million, six hundred twenty-one thousand, two hundred fifty-six".