1620244 has 12 divisors (see below), whose sum is σ = 2984800. Its totient is φ = 767448.

The previous prime is 1620239. The next prime is 1620247. The reversal of 1620244 is 4420261.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620247) 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, 10584 + ... + 10735.

2^1620244 is an apocalyptic number.

It is an amenable number.

1620244 is a deficient number, since it is larger than the sum of its proper divisors (1364556).

1620244 is a wasteful number, since it uses less digits than its factorization.

1620244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21342 (or 21340 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1620244 is about 1272.8880547794. Note that the first 3 decimals coincide. The cubic root of 1620244 is about 117.4519254064.

The spelling of 1620244 in words is "one million, six hundred twenty thousand, two hundred forty-four".