690197 has 4 divisors (see below), whose sum is σ = 691980. Its totient is φ = 688416.

The previous prime is 690187. The next prime is 690233. The reversal of 690197 is 791096.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64516 + 625681 = 254^2 + 791^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (172995).

2⁶⁹⁰¹⁹⁷ is an apocalyptic number.

It is an amenable number.

690197 is a deficient number, since it is larger than the sum of its proper divisors (1783).

690197 is a wasteful number, since it uses less digits than its factorization.

690197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 690197 is about 830.7809578944. The cubic root of 690197 is about 88.3739680930.

The spelling of 690197 in words is "six hundred ninety thousand, one hundred ninety-seven".