1620944 has 20 divisors (see below), whose sum is σ = 3382596. Its totient is φ = 748032.

The previous prime is 1620929. The next prime is 1620961. The reversal of 1620944 is 4490261.

It can be written as a sum of positive squares in 2 ways, for example, as 1000000 + 620944 = 1000^2 + 788^2 .

It is a super-2 number, since 2×1620944² = 5254918902272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3689 + ... + 4104.

2^1620944 is an apocalyptic number.

It is an amenable number.

1620944 is an abundant number, since it is smaller than the sum of its proper divisors (1761652).

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

1620944 is a wasteful number, since it uses less digits than its factorization.

1620944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7814 (or 7808 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1620944 is about 1273.1629903512. The cubic root of 1620944 is about 117.4688373675.

The spelling of 1620944 in words is "one million, six hundred twenty thousand, nine hundred forty-four".