689440434 has 16 divisors (see below), whose sum is σ = 1423361280. Its totient is φ = 222400080.

The previous prime is 689440421. The next prime is 689440439. The reversal of 689440434 is 434044986.

It is a super-2 number, since 2×689440434² = 950656224068216712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (689440439) 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 7 ways as a sum of consecutive naturals, for example, 1853149 + ... + 1853520.

It is an arithmetic number, because the mean of its divisors is an integer number (88960080).

Almost surely, 2^689440434 is an apocalyptic number.

689440434 is an abundant number, since it is smaller than the sum of its proper divisors (733920846).

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

689440434 is a wasteful number, since it uses less digits than its factorization.

689440434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706705.

The product of its (nonzero) digits is 331776, while the sum is 42.

The square root of 689440434 is about 26257.1977560440. The cubic root of 689440434 is about 883.4166563227.

The spelling of 689440434 in words is "six hundred eighty-nine million, four hundred forty thousand, four hundred thirty-four".