1620065 has 8 divisors (see below), whose sum is σ = 1951080. Its totient is φ = 1291392.

The previous prime is 1620041. The next prime is 1620071. The reversal of 1620065 is 5600261.

It can be written as a sum of positive squares in 4 ways, for example, as 160801 + 1459264 = 401^2 + 1208^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1620065 - 2⁶ = 1620001 is a prime.

It is a super-2 number, since 2×1620065² = 5249221208450, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1931 + ... + 2639.

It is an arithmetic number, because the mean of its divisors is an integer number (243885).

2^1620065 is an apocalyptic number.

It is an amenable number.

1620065 is a deficient number, since it is larger than the sum of its proper divisors (331015).

1620065 is an equidigital number, since it uses as much as digits as its factorization.

1620065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1620065 is about 1272.8177402912. The cubic root of 1620065 is about 117.4475999943.

The spelling of 1620065 in words is "one million, six hundred twenty thousand, sixty-five".