406687397 has 2 divisors, whose sum is σ = 406687398. Its totient is φ = 406687396.

The previous prime is 406687367. The next prime is 406687399. The reversal of 406687397 is 793786604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238362721 + 168324676 = 15439^2 + 12974^2 .

It is a cyclic number.

It is not a de Polignac number, because 406687397 - 2¹⁰ = 406686373 is a prime.

Together with 406687399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406687399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203343698 + 203343699.

It is an arithmetic number, because the mean of its divisors is an integer number (203343699).

Almost surely, 2^406687397 is an apocalyptic number.

It is an amenable number.

406687397 is a deficient number, since it is larger than the sum of its proper divisors (1).

406687397 is an equidigital number, since it uses as much as digits as its factorization.

406687397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The square root of 406687397 is about 20166.4919358822. The cubic root of 406687397 is about 740.8897242046.

The spelling of 406687397 in words is "four hundred six million, six hundred eighty-seven thousand, three hundred ninety-seven".