1646420 has 24 divisors (see below), whose sum is σ = 3483648. Its totient is φ = 653600.

The previous prime is 1646413. The next prime is 1646423. The reversal of 1646420 is 246461.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646423) by changing a digit.

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, 3605 + ... + 4035.

It is an arithmetic number, because the mean of its divisors is an integer number (145152).

2^1646420 is an apocalyptic number.

1646420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646420 is an abundant number, since it is smaller than the sum of its proper divisors (1837228).

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

1646420 is a wasteful number, since it uses less digits than its factorization.

1646420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1646420 is about 1283.1289880600. The cubic root of 1646420 is about 118.0810512767.

The spelling of 1646420 in words is "one million, six hundred forty-six thousand, four hundred twenty".