1621944 has 40 divisors (see below), whose sum is σ = 4544760. Its totient is φ = 540432.

The previous prime is 1621933. The next prime is 1621979. The reversal of 1621944 is 4491261.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 6.

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 9 ways as a sum of consecutive naturals, for example, 604 + ... + 1899.

It is an arithmetic number, because the mean of its divisors is an integer number (113619).

2^1621944 is an apocalyptic number.

It is an amenable number.

1621944 is an abundant number, since it is smaller than the sum of its proper divisors (2922816).

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

1621944 is a wasteful number, since it uses less digits than its factorization.

1621944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521 (or 2508 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1621944 is about 1273.5556524942. Note that the first 3 decimals coincide. The cubic root of 1621944 is about 117.4929888679.

The spelling of 1621944 in words is "one million, six hundred twenty-one thousand, nine hundred forty-four".