400601309 has 2 divisors, whose sum is σ = 400601310. Its totient is φ = 400601308.

The previous prime is 400601293. The next prime is 400601317. The reversal of 400601309 is 903106004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 304502500 + 96098809 = 17450^2 + 9803^2 .

It is a cyclic number.

It is not a de Polignac number, because 400601309 - 2⁴ = 400601293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400609309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200300654 + 200300655.

It is an arithmetic number, because the mean of its divisors is an integer number (200300655).

Almost surely, 2^400601309 is an apocalyptic number.

It is an amenable number.

400601309 is a deficient number, since it is larger than the sum of its proper divisors (1).

400601309 is an equidigital number, since it uses as much as digits as its factorization.

400601309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 400601309 is about 20015.0270796719. The cubic root of 400601309 is about 737.1753217590.

The spelling of 400601309 in words is "four hundred million, six hundred one thousand, three hundred nine".