1620265 has 4 divisors (see below), whose sum is σ = 1944324. Its totient is φ = 1296208.

The previous prime is 1620257. The next prime is 1620271. The reversal of 1620265 is 5620261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5620261 = 89 ⋅63149.

It can be written as a sum of positive squares in 2 ways, for example, as 173056 + 1447209 = 416^2 + 1203^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620265 - 2³ = 1620257 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162022 + ... + 162031.

It is an arithmetic number, because the mean of its divisors is an integer number (486081).

2^1620265 is an apocalyptic number.

It is an amenable number.

1620265 is a deficient number, since it is larger than the sum of its proper divisors (324059).

1620265 is an equidigital number, since it uses as much as digits as its factorization.

1620265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324058.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1620265 is about 1272.8963037106. The cubic root of 1620265 is about 117.4524328361.

The spelling of 1620265 in words is "one million, six hundred twenty thousand, two hundred sixty-five".