1631660 has 24 divisors (see below), whose sum is σ = 3628800. Its totient is φ = 614144.

The previous prime is 1631659. The next prime is 1631683. The reversal of 1631660 is 661361.

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 7 ways as a sum of consecutive naturals, for example, 2060 + ... + 2739.

It is an arithmetic number, because the mean of its divisors is an integer number (151200).

2^1631660 is an apocalyptic number.

1631660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1631660 is an abundant number, since it is smaller than the sum of its proper divisors (1997140).

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

1631660 is a wasteful number, since it uses less digits than its factorization.

1631660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825 (or 4823 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1631660 is about 1277.3644742203. The cubic root of 1631660 is about 117.7271297069.

Subtracting from 1631660 its reverse (661361), we obtain a cube (970299 = 99³).

The spelling of 1631660 in words is "one million, six hundred thirty-one thousand, six hundred sixty".