400680307 has 2 divisors, whose sum is σ = 400680308. Its totient is φ = 400680306.

The previous prime is 400680299. The next prime is 400680317. The reversal of 400680307 is 703086004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400680307 - 2³ = 400680299 is a prime.

It is a super-2 number, since 2×400680307² = 321089416835228498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400680317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200340153 + 200340154.

It is an arithmetic number, because the mean of its divisors is an integer number (200340154).

Almost surely, 2^400680307 is an apocalyptic number.

400680307 is a deficient number, since it is larger than the sum of its proper divisors (1).

400680307 is an equidigital number, since it uses as much as digits as its factorization.

400680307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 400680307 is about 20017.0004496178. Note that the first 3 decimals coincide. The cubic root of 400680307 is about 737.2237752107.

The spelling of 400680307 in words is "four hundred million, six hundred eighty thousand, three hundred seven".