1662820 has 24 divisors (see below), whose sum is σ = 3544128. Its totient is φ = 655200.

The previous prime is 1662803. The next prime is 1662833. The reversal of 1662820 is 282661.

It is a super-3 number, since 3×1662820³ = 13792944004133304000, which contains 333 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835 + ... + 2005.

It is an arithmetic number, because the mean of its divisors is an integer number (147672).

2^1662820 is an apocalyptic number.

1662820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662820 is an abundant number, since it is smaller than the sum of its proper divisors (1881308).

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

1662820 is a wasteful number, since it uses less digits than its factorization.

1662820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251 (or 1249 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1662820 is about 1289.5037805295. The cubic root of 1662820 is about 118.4718253324.

The spelling of 1662820 in words is "one million, six hundred sixty-two thousand, eight hundred twenty".