1643423450 has 96 divisors (see below), whose sum is σ = 3267903936. Its totient is φ = 613992960.

The previous prime is 1643423437. The next prime is 1643423501. The reversal of 1643423450 is 543243461.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 5807009 + ... + 5807291.

It is an arithmetic number, because the mean of its divisors is an integer number (34040666).

Almost surely, 2^1643423450 is an apocalyptic number.

1643423450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1643423450 is a deficient number, since it is larger than the sum of its proper divisors (1624480486).

1643423450 is a wasteful number, since it uses less digits than its factorization.

1643423450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 1643423450 is about 40539.1594634127. The cubic root of 1643423450 is about 1180.0937036572.

The spelling of 1643423450 in words is "one billion, six hundred forty-three million, four hundred twenty-three thousand, four hundred fifty".