1620844 has 6 divisors (see below), whose sum is σ = 2836484. Its totient is φ = 810420.

The previous prime is 1620841. The next prime is 1620881. The reversal of 1620844 is 4480261.

It is not an unprimeable number, because it can be changed into a prime (1620841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202602 + ... + 202609.

2^1620844 is an apocalyptic number.

It is an amenable number.

1620844 is a deficient number, since it is larger than the sum of its proper divisors (1215640).

1620844 is a wasteful number, since it uses less digits than its factorization.

1620844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405215 (or 405213 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 1620844 is about 1273.1237174760. The cubic root of 1620844 is about 117.4664216712.

The spelling of 1620844 in words is "one million, six hundred twenty thousand, eight hundred forty-four".