1670220 has 60 divisors (see below), whose sum is σ = 5244624. Its totient is φ = 444960.

The previous prime is 1670213. The next prime is 1670269. The reversal of 1670220 is 220761.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 1670193 and 1670202.

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 19 ways as a sum of consecutive naturals, for example, 1105 + ... + 2135.

2^1670220 is an apocalyptic number.

1670220 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 1670220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2622312).

1670220 is an abundant number, since it is smaller than the sum of its proper divisors (3574404).

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

1670220 is a wasteful number, since it uses less digits than its factorization.

1670220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052 (or 1041 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1670220 is about 1292.3699160844. The cubic root of 1670220 is about 118.6473091908.

Adding to 1670220 its reverse (220761), we get a palindrome (1890981).

The spelling of 1670220 in words is "one million, six hundred seventy thousand, two hundred twenty".