690386 has 4 divisors (see below), whose sum is σ = 1035582. Its totient is φ = 345192.

The previous prime is 690377. The next prime is 690397. The reversal of 690386 is 683096.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 534361 + 156025 = 731^2 + 395^2 .

It is an unprimeable number.

690386 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172595 + ... + 172598.

2⁶⁹⁰³⁸⁶ is an apocalyptic number.

690386 is a deficient number, since it is larger than the sum of its proper divisors (345196).

690386 is a wasteful number, since it uses less digits than its factorization.

690386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345195.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 690386 is about 830.8946985028. The cubic root of 690386 is about 88.3820339812.

The spelling of 690386 in words is "six hundred ninety thousand, three hundred eighty-six".