1642220 has 24 divisors (see below), whose sum is σ = 3477264. Its totient is φ = 651456.

The previous prime is 1642211. The next prime is 1642231. The reversal of 1642220 is 222461.

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 7 ways as a sum of consecutive naturals, for example, 2879 + ... + 3401.

It is an arithmetic number, because the mean of its divisors is an integer number (144886).

2^1642220 is an apocalyptic number.

1642220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642220 is an abundant number, since it is smaller than the sum of its proper divisors (1835044).

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

1642220 is a wasteful number, since it uses less digits than its factorization.

1642220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1642220 is about 1281.4913187377. The cubic root of 1642220 is about 117.9805579383.

Adding to 1642220 its reverse (222461), we get a palindrome (1864681).

The spelling of 1642220 in words is "one million, six hundred forty-two thousand, two hundred twenty".