1621602 has 12 divisors (see below), whose sum is σ = 3513510. Its totient is φ = 540528.

The previous prime is 1621597. The next prime is 1621619. The reversal of 1621602 is 2061261.

It is a happy number.

1621602 is a `hidden beast` number, since 1 + 62 + 1 + 602 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1320201 + 301401 = 1149^2 + 549^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 90089 = 1621602 / (1 + 6 + 2 + 1 + 6 + 0 + 2).

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 5 ways as a sum of consecutive naturals, for example, 45027 + ... + 45062.

2^1621602 is an apocalyptic number.

1621602 is an abundant number, since it is smaller than the sum of its proper divisors (1891908).

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

1621602 is a wasteful number, since it uses less digits than its factorization.

1621602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90097 (or 90094 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1621602 is about 1273.4213756648. The cubic root of 1621602 is about 117.4847301720.

Adding to 1621602 its reverse (2061261), we get a palindrome (3682863).

It can be divided in two parts, 162 and 1602, that added together give a square (1764 = 42²).

The spelling of 1621602 in words is "one million, six hundred twenty-one thousand, six hundred two".