690861 has 8 divisors (see below), whose sum is σ = 925024. Its totient is φ = 458640.

The previous prime is 690841. The next prime is 690869. The reversal of 690861 is 168096.

690861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 690861 - 2¹¹ = 688813 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 690861.

It is not an unprimeable number, because it can be changed into a prime (690869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 990 + ... + 1536.

It is an arithmetic number, because the mean of its divisors is an integer number (115628).

2⁶⁹⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

690861 is a deficient number, since it is larger than the sum of its proper divisors (234163).

690861 is a wasteful number, since it uses less digits than its factorization.

690861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 690861 is about 831.1804858152. The cubic root of 690861 is about 88.4022988967.

It can be divided in two parts, 690 and 861, that added together give a palindrome (1551).

The spelling of 690861 in words is "six hundred ninety thousand, eight hundred sixty-one".