1646438922 has 48 divisors (see below), whose sum is σ = 3654623232. Its totient is φ = 535520160.

The previous prime is 1646438917. The next prime is 1646438929. The reversal of 1646438922 is 2298346461.

It is a super-2 number, since 2×1646438922² = 5421522247753044168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1646438929) 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 23 ways as a sum of consecutive naturals, for example, 133543 + ... + 145349.

It is an arithmetic number, because the mean of its divisors is an integer number (76137984).

Almost surely, 2^1646438922 is an apocalyptic number.

1646438922 is an abundant number, since it is smaller than the sum of its proper divisors (2008184310).

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

1646438922 is a wasteful number, since it uses less digits than its factorization.

1646438922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12003 (or 12000 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 1646438922 is about 40576.3345067048. The cubic root of 1646438922 is about 1180.8150363622.

The spelling of 1646438922 in words is "one billion, six hundred forty-six million, four hundred thirty-eight thousand, nine hundred twenty-two".