689746 has 4 divisors (see below), whose sum is σ = 1034622. Its totient is φ = 344872.

The previous prime is 689723. The next prime is 689761. The reversal of 689746 is 647986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 497025 + 192721 = 705^2 + 439^2 .

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 689699 and 689708.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172435 + ... + 172438.

2⁶⁸⁹⁷⁴⁶ is an apocalyptic number.

689746 is a deficient number, since it is larger than the sum of its proper divisors (344876).

689746 is a wasteful number, since it uses less digits than its factorization.

689746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344875.

The product of its digits is 72576, while the sum is 40.

The square root of 689746 is about 830.5094821855. The cubic root of 689746 is about 88.3547149696.

The spelling of 689746 in words is "six hundred eighty-nine thousand, seven hundred forty-six".