1620626 has 24 divisors (see below), whose sum is σ = 2954880. Its totient is φ = 663432.

The previous prime is 1620617. The next prime is 1620629. The reversal of 1620626 is 6260261.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1620629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1895 + ... + 2613.

It is an arithmetic number, because the mean of its divisors is an integer number (123120).

2^1620626 is an apocalyptic number.

1620626 is a deficient number, since it is larger than the sum of its proper divisors (1334254).

1620626 is a wasteful number, since it uses less digits than its factorization.

1620626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758 (or 751 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1620626 is about 1273.0380984087. The cubic root of 1620626 is about 117.4611551088.

Adding to 1620626 its reverse (6260261), we get a palindrome (7880887).

The spelling of 1620626 in words is "one million, six hundred twenty thousand, six hundred twenty-six".