1643673042 has 24 divisors (see below), whose sum is σ = 3885045840. Its totient is φ = 498082680.

The previous prime is 1643673029. The next prime is 1643673043. The reversal of 1643673042 is 2403763461.

It is a happy number.

1643673042 is a `hidden beast` number, since 1 + 643 + 6 + 7 + 3 + 0 + 4 + 2 = 666.

It is a super-2 number, since 2×1643673042² = 5403322137995067528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1643672988 and 1643673006.

It is not an unprimeable number, because it can be changed into a prime (1643673043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4150492 + ... + 4150887.

It is an arithmetic number, because the mean of its divisors is an integer number (161876910).

Almost surely, 2^1643673042 is an apocalyptic number.

1643673042 is an abundant number, since it is smaller than the sum of its proper divisors (2241372798).

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

1643673042 is a wasteful number, since it uses less digits than its factorization.

1643673042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8301398 (or 8301395 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 1643673042 is about 40542.2377527437. The cubic root of 1643673042 is about 1180.1534421739.

The spelling of 1643673042 in words is "one billion, six hundred forty-three million, six hundred seventy-three thousand, forty-two".