1566220 has 12 divisors (see below), whose sum is σ = 3289104. Its totient is φ = 626480.

The previous prime is 1566217. The next prime is 1566239. The reversal of 1566220 is 226651.

It is a junction number, because it is equal to n+sod(n) for n = 1566191 and 1566200.

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 3 ways as a sum of consecutive naturals, for example, 39136 + ... + 39175.

It is an arithmetic number, because the mean of its divisors is an integer number (274092).

2^1566220 is an apocalyptic number.

1566220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1566220 is an abundant number, since it is smaller than the sum of its proper divisors (1722884).

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

1566220 is a wasteful number, since it uses less digits than its factorization.

1566220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78320 (or 78318 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1566220 is about 1251.4871153951. The cubic root of 1566220 is about 116.1317369774.

The spelling of 1566220 in words is "one million, five hundred sixty-six thousand, two hundred twenty".