691930 has 8 divisors (see below), whose sum is σ = 1245492. Its totient is φ = 276768.

The previous prime is 691921. The next prime is 691931. The reversal of 691930 is 39196.

691930 = 370² + 371² + ... + 374².

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 690561 + 1369 = 831^2 + 37^2 .

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

It is not an unprimeable number, because it can be changed into a prime (691931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34587 + ... + 34606.

2⁶⁹¹⁹³⁰ is an apocalyptic number.

691930 is a deficient number, since it is larger than the sum of its proper divisors (553562).

691930 is a wasteful number, since it uses less digits than its factorization.

691930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69200.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 691930 is about 831.8232985436. The cubic root of 691930 is about 88.4478716708.

The spelling of 691930 in words is "six hundred ninety-one thousand, nine hundred thirty".