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689439 = 3229813
BaseRepresentation
bin10101000010100011111
31022000201210
42220110133
5134030224
622435503
75601012
oct2502437
91260653
10689439
11430a93
12292b93
131b1a6a
1413d379
15d9429
hexa851f

689439 has 4 divisors (see below), whose sum is σ = 919256. Its totient is φ = 459624.

The previous prime is 689431. The next prime is 689441. The reversal of 689439 is 934986.

689439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 689439 - 23 = 689431 is a prime.

It is a super-2 number, since 2×6894392 = 950652269442, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 689397 and 689406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114904 + ... + 114909.

It is an arithmetic number, because the mean of its divisors is an integer number (229814).

2689439 is an apocalyptic number.

689439 is a deficient number, since it is larger than the sum of its proper divisors (229817).

689439 is a wasteful number, since it uses less digits than its factorization.

689439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229816.

The product of its digits is 46656, while the sum is 39.

The square root of 689439 is about 830.3246353084. The cubic root of 689439 is about 88.3416043835.

It can be divided in two parts, 689 and 439, that added together give a triangular number (1128 = T47).

The spelling of 689439 in words is "six hundred eighty-nine thousand, four hundred thirty-nine".

Divisors: 1 3 229813 689439