1620055 has 4 divisors (see below), whose sum is σ = 1944072. Its totient is φ = 1296040.

The previous prime is 1620041. The next prime is 1620071. The reversal of 1620055 is 5500261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5500261 = 13 ⋅423097.

It is not a de Polignac number, because 1620055 - 2¹¹ = 1618007 is a prime.

It is a Duffinian number.

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, 162001 + ... + 162010.

It is an arithmetic number, because the mean of its divisors is an integer number (486018).

2^1620055 is an apocalyptic number.

1620055 is a deficient number, since it is larger than the sum of its proper divisors (324017).

1620055 is an equidigital number, since it uses as much as digits as its factorization.

1620055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324016.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 1620055 is about 1272.8138119929. The cubic root of 1620055 is about 117.4473583418.

The spelling of 1620055 in words is "one million, six hundred twenty thousand, fifty-five".