1620344 has 16 divisors (see below), whose sum is σ = 3314520. Its totient is φ = 736480.

The previous prime is 1620337. The next prime is 1620347. The reversal of 1620344 is 4430261.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620347) by changing a digit.

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, 9119 + ... + 9294.

2^1620344 is an apocalyptic number.

It is an amenable number.

1620344 is an abundant number, since it is smaller than the sum of its proper divisors (1694176).

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

1620344 is a wasteful number, since it uses less digits than its factorization.

1620344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18430 (or 18426 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1620344 is about 1272.9273349253. The cubic root of 1620344 is about 117.4543416990.

The spelling of 1620344 in words is "one million, six hundred twenty thousand, three hundred forty-four".