1661632 has 28 divisors (see below), whose sum is σ = 3769360. Its totient is φ = 711936.

The previous prime is 1661629. The next prime is 1661641. The reversal of 1661632 is 2361661.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×1661632² = 5522041806848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1661597 and 1661606.

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, 1407 + ... + 2302.

It is an arithmetic number, because the mean of its divisors is an integer number (134620).

2^1661632 is an apocalyptic number.

It is an amenable number.

1661632 is an abundant number, since it is smaller than the sum of its proper divisors (2107728).

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

1661632 is an equidigital number, since it uses as much as digits as its factorization.

1661632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3728 (or 3718 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 1661632 is about 1289.0430559140. The cubic root of 1661632 is about 118.4436045869.

The spelling of 1661632 in words is "one million, six hundred sixty-one thousand, six hundred thirty-two".