659940397 has 2 divisors, whose sum is σ = 659940398. Its totient is φ = 659940396.

The previous prime is 659940389. The next prime is 659940439. The reversal of 659940397 is 793049956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657717316 + 2223081 = 25646^2 + 1491^2 .

It is a cyclic number.

It is not a de Polignac number, because 659940397 - 2³ = 659940389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (659941397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329970198 + 329970199.

It is an arithmetic number, because the mean of its divisors is an integer number (329970199).

Almost surely, 2^659940397 is an apocalyptic number.

It is an amenable number.

659940397 is a deficient number, since it is larger than the sum of its proper divisors (1).

659940397 is an equidigital number, since it uses as much as digits as its factorization.

659940397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 52.

The square root of 659940397 is about 25689.3051093252. The cubic root of 659940397 is about 870.6325593008.

The spelling of 659940397 in words is "six hundred fifty-nine million, nine hundred forty thousand, three hundred ninety-seven".