1643534358 has 16 divisors (see below), whose sum is σ = 3303756720. Its totient is φ = 545063456.

The previous prime is 1643534357. The next prime is 1643534393. The reversal of 1643534358 is 8534353461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643534351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694053 + ... + 696416.

It is an arithmetic number, because the mean of its divisors is an integer number (206484795).

Almost surely, 2^1643534358 is an apocalyptic number.

1643534358 is an abundant number, since it is smaller than the sum of its proper divisors (1660222362).

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

1643534358 is a wasteful number, since it uses less digits than its factorization.

1643534358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390671.

The product of its digits is 518400, while the sum is 42.

The square root of 1643534358 is about 40540.5273522681. The cubic root of 1643534358 is about 1180.1202496433.

The spelling of 1643534358 in words is "one billion, six hundred forty-three million, five hundred thirty-four thousand, three hundred fifty-eight".