690406 has 8 divisors (see below), whose sum is σ = 1045440. Its totient is φ = 341928.

The previous prime is 690397. The next prime is 690407. The reversal of 690406 is 604096.

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

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690407) 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, 1366 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (130680).

2⁶⁹⁰⁴⁰⁶ is an apocalyptic number.

690406 is a deficient number, since it is larger than the sum of its proper divisors (355034).

690406 is a wasteful number, since it uses less digits than its factorization.

690406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 690406 is about 830.9067336350. The cubic root of 690406 is about 88.3828874282.

The spelling of 690406 in words is "six hundred ninety thousand, four hundred six".