400109893 has 2 divisors, whose sum is σ = 400109894. Its totient is φ = 400109892.

The previous prime is 400109867. The next prime is 400109903. The reversal of 400109893 is 398901004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 346629924 + 53479969 = 18618^2 + 7313^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400109893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400106893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200054946 + 200054947.

It is an arithmetic number, because the mean of its divisors is an integer number (200054947).

Almost surely, 2^400109893 is an apocalyptic number.

It is an amenable number.

400109893 is a deficient number, since it is larger than the sum of its proper divisors (1).

400109893 is an equidigital number, since it uses as much as digits as its factorization.

400109893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 400109893 is about 20002.7471363310. The cubic root of 400109893 is about 736.8737684288.

The spelling of 400109893 in words is "four hundred million, one hundred nine thousand, eight hundred ninety-three".