1621244 has 12 divisors (see below), whose sum is σ = 2847600. Its totient is φ = 807648.

The previous prime is 1621241. The next prime is 1621259. The reversal of 1621244 is 4421261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621241) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 872 + ... + 2000.

It is an arithmetic number, because the mean of its divisors is an integer number (237300).

2^1621244 is an apocalyptic number.

It is an amenable number.

1621244 is a deficient number, since it is larger than the sum of its proper divisors (1226356).

1621244 is a wasteful number, since it uses less digits than its factorization.

1621244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492 (or 1490 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 1621244 is about 1273.2808017087. The cubic root of 1621244 is about 117.4760838603.

The spelling of 1621244 in words is "one million, six hundred twenty-one thousand, two hundred forty-four".