1646044420 has 24 divisors (see below), whose sum is σ = 3474072000. Its totient is φ = 655107552.

The previous prime is 1646044403. The next prime is 1646044453. The reversal of 1646044420 is 244406461.

It is a super-2 number, since 2×1646044420² = 5418924465226272800, which contains 22 as substring.

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, 202810 + ... + 210769.

It is an arithmetic number, because the mean of its divisors is an integer number (144753000).

Almost surely, 2^1646044420 is an apocalyptic number.

1646044420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646044420 is an abundant number, since it is smaller than the sum of its proper divisors (1828027580).

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

1646044420 is a wasteful number, since it uses less digits than its factorization.

1646044420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413787 (or 413785 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 1646044420 is about 40571.4729828731. The cubic root of 1646044420 is about 1180.7207174257.

The spelling of 1646044420 in words is "one billion, six hundred forty-six million, forty-four thousand, four hundred twenty".