689187406 has 8 divisors (see below), whose sum is σ = 1034630064. Its totient is φ = 344310720.

The previous prime is 689187397. The next prime is 689187427. The reversal of 689187406 is 604781986.

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

It is a self number, because there is not a number n which added to its sum of digits gives 689187406.

It is a congruent number.

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, 138435 + ... + 143326.

It is an arithmetic number, because the mean of its divisors is an integer number (129328758).

Almost surely, 2^689187406 is an apocalyptic number.

689187406 is a deficient number, since it is larger than the sum of its proper divisors (345442658).

689187406 is a wasteful number, since it uses less digits than its factorization.

689187406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282986.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 689187406 is about 26252.3790540972. The cubic root of 689187406 is about 883.3085703592.

The spelling of 689187406 in words is "six hundred eighty-nine million, one hundred eighty-seven thousand, four hundred six".