690539 has 4 divisors (see below), whose sum is σ = 699360. Its totient is φ = 681720.

The previous prime is 690533. The next prime is 690541. The reversal of 690539 is 935096.

690539 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690539 is a prime.

It is a super-2 number, since 2×690539² = 953688221042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690533) 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, 4292 + ... + 4449.

It is an arithmetic number, because the mean of its divisors is an integer number (174840).

2⁶⁹⁰⁵³⁹ is an apocalyptic number.

690539 is a deficient number, since it is larger than the sum of its proper divisors (8821).

690539 is an equidigital number, since it uses as much as digits as its factorization.

690539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8820.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 690539 is about 830.9867628308. The cubic root of 690539 is about 88.3885624317.

The spelling of 690539 in words is "six hundred ninety thousand, five hundred thirty-nine".