1566920 has 32 divisors (see below), whose sum is σ = 3611520. Its totient is φ = 611520.

The previous prime is 1566893. The next prime is 1566923. The reversal of 1566920 is 296651.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1566923) by changing a digit.

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, 1265 + ... + 2175.

It is an arithmetic number, because the mean of its divisors is an integer number (112860).

2^1566920 is an apocalyptic number.

1566920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1566920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1805760).

1566920 is an abundant number, since it is smaller than the sum of its proper divisors (2044600).

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

1566920 is a wasteful number, since it uses less digits than its factorization.

1566920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965 (or 961 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1566920 is about 1251.7667514357. The cubic root of 1566920 is about 116.1490355493.

The spelling of 1566920 in words is "one million, five hundred sixty-six thousand, nine hundred twenty".