1643534834 has 16 divisors (see below), whose sum is σ = 2508737496. Its totient is φ = 807321600.

The previous prime is 1643534807. The next prime is 1643534911. The reversal of 1643534834 is 4384353461.

It can be written as a sum of positive squares in 4 ways, for example, as 1432849609 + 210685225 = 37853^2 + 14515^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1643534791 and 1643534800.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99314 + ... + 114674.

Almost surely, 2^1643534834 is an apocalyptic number.

1643534834 is a deficient number, since it is larger than the sum of its proper divisors (865202662).

1643534834 is a wasteful number, since it uses less digits than its factorization.

1643534834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16301.

The product of its digits is 414720, while the sum is 41.

The square root of 1643534834 is about 40540.5332229363. The cubic root of 1643534834 is about 1180.1203635720.

The spelling of 1643534834 in words is "one billion, six hundred forty-three million, five hundred thirty-four thousand, eight hundred thirty-four".