1661622 has 16 divisors (see below), whose sum is σ = 3345600. Its totient is φ = 550152.

The previous prime is 1661599. The next prime is 1661623. The reversal of 1661622 is 2261661.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1661592 and 1661601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129 + ... + 1827.

It is an arithmetic number, because the mean of its divisors is an integer number (209100).

2^1661622 is an apocalyptic number.

1661622 is an abundant number, since it is smaller than the sum of its proper divisors (1683978).

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

1661622 is a wasteful number, since it uses less digits than its factorization.

1661622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867.

The product of its digits is 864, while the sum is 24.

The square root of 1661622 is about 1289.0391770617. The cubic root of 1661622 is about 118.4433669815.

The spelling of 1661622 in words is "one million, six hundred sixty-one thousand, six hundred twenty-two".