698405 has 4 divisors (see below), whose sum is σ = 838092. Its totient is φ = 558720.

The previous prime is 698393. The next prime is 698413. The reversal of 698405 is 504896.

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

It can be written as a sum of positive squares in 2 ways, for example, as 155236 + 543169 = 394^2 + 737^2 .

It is not a de Polignac number, because 698405 - 2¹⁰ = 697381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 698405.

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, 69836 + ... + 69845.

It is an arithmetic number, because the mean of its divisors is an integer number (209523).

2⁶⁹⁸⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

698405 is a deficient number, since it is larger than the sum of its proper divisors (139687).

698405 is a wasteful number, since it uses less digits than its factorization.

698405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139686.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 698405 is about 835.7062881180. The cubic root of 698405 is about 88.7229104652.

The spelling of 698405 in words is "six hundred ninety-eight thousand, four hundred five".