1646364140 has 24 divisors (see below), whose sum is σ = 3465258720. Its totient is φ = 657042048.

The previous prime is 1646364073. The next prime is 1646364149. The reversal of 1646364140 is 414636461.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1646364140.

It is not an unprimeable number, because it can be changed into a prime (1646364149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84977 + ... + 102536.

It is an arithmetic number, because the mean of its divisors is an integer number (144385780).

Almost surely, 2^1646364140 is an apocalyptic number.

1646364140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646364140 is an abundant number, since it is smaller than the sum of its proper divisors (1818894580).

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

1646364140 is a wasteful number, since it uses less digits than its factorization.

1646364140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187961 (or 187959 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 1646364140 is about 40575.4129985143. The cubic root of 1646364140 is about 1180.7971583740.

The spelling of 1646364140 in words is "one billion, six hundred forty-six million, three hundred sixty-four thousand, one hundred forty".