1620522 has 24 divisors (see below), whose sum is σ = 3536676. Its totient is φ = 536256.

The previous prime is 1620517. The next prime is 1620523. The reversal of 1620522 is 2250261.

It can be written as a sum of positive squares in 2 ways, for example, as 1212201 + 408321 = 1101^2 + 639^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1620495 and 1620504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620523) 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, 3318 + ... + 3774.

2^1620522 is an apocalyptic number.

1620522 is an abundant number, since it is smaller than the sum of its proper divisors (1916154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620522 is a wasteful number, since it uses less digits than its factorization.

1620522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1620522 is about 1272.9972505862. The cubic root of 1620522 is about 117.4586424539.

Adding to 1620522 its reverse (2250261), we get a palindrome (3870783).

The spelling of 1620522 in words is "one million, six hundred twenty thousand, five hundred twenty-two".