1672220 has 36 divisors (see below), whose sum is σ = 3865512. Its totient is φ = 607200.

The previous prime is 1672219. The next prime is 1672243. The reversal of 1672220 is 222761.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1672192 and 1672201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2075 + ... + 2765.

2^1672220 is an apocalyptic number.

1672220 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 1672220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1932756).

1672220 is an abundant number, since it is smaller than the sum of its proper divisors (2193292).

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

1672220 is a wasteful number, since it uses less digits than its factorization.

1672220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 709 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1672220 is about 1293.1434568523. The cubic root of 1672220 is about 118.6946482570.

Adding to 1672220 its reverse (222761), we get a palindrome (1894981).

The spelling of 1672220 in words is "one million, six hundred seventy-two thousand, two hundred twenty".