1621844 has 12 divisors (see below), whose sum is σ = 3243744. Its totient is φ = 695064.

The previous prime is 1621843. The next prime is 1621849. The reversal of 1621844 is 4481261.

1621844 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28934 + ... + 28989.

It is an arithmetic number, because the mean of its divisors is an integer number (270312).

2^1621844 is an apocalyptic number.

1621844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1621844 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1621844 is a wasteful number, since it uses less digits than its factorization.

1621844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57934 (or 57932 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 1621844 is about 1273.5163917280. The cubic root of 1621844 is about 117.4905741647.

The spelling of 1621844 in words is "one million, six hundred twenty-one thousand, eight hundred forty-four".