689731394 has 8 divisors (see below), whose sum is σ = 1128651408. Its totient is φ = 313514260.

The previous prime is 689731387. The next prime is 689731409. The reversal of 689731394 is 493137986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15675692 + ... + 15675735.

It is an arithmetic number, because the mean of its divisors is an integer number (141081426).

Almost surely, 2^689731394 is an apocalyptic number.

689731394 is a deficient number, since it is larger than the sum of its proper divisors (438920014).

689731394 is a wasteful number, since it uses less digits than its factorization.

689731394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31351440.

The product of its digits is 979776, while the sum is 50.

The square root of 689731394 is about 26262.7377476150. The cubic root of 689731394 is about 883.5409130132.

The spelling of 689731394 in words is "six hundred eighty-nine million, seven hundred thirty-one thousand, three hundred ninety-four".