690168439 has 2 divisors, whose sum is σ = 690168440. Its totient is φ = 690168438.

The previous prime is 690168379. The next prime is 690168463. The reversal of 690168439 is 934861096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690168439 - 2⁹ = 690167927 is a prime.

It is a super-3 number, since 3×690168439³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690162439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345084219 + 345084220.

It is an arithmetic number, because the mean of its divisors is an integer number (345084220).

Almost surely, 2^690168439 is an apocalyptic number.

690168439 is a deficient number, since it is larger than the sum of its proper divisors (1).

690168439 is an equidigital number, since it uses as much as digits as its factorization.

690168439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 690168439 is about 26271.0570590526. The cubic root of 690168439 is about 883.7274907691.

The spelling of 690168439 in words is "six hundred ninety million, one hundred sixty-eight thousand, four hundred thirty-nine".