400920193 has 2 divisors, whose sum is σ = 400920194. Its totient is φ = 400920192.

The previous prime is 400920167. The next prime is 400920209. The reversal of 400920193 is 391029004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397723249 + 3196944 = 19943^2 + 1788^2 .

It is a cyclic number.

It is not a de Polignac number, because 400920193 - 2⁹ = 400919681 is a prime.

It is not a weakly prime, because it can be changed into another prime (400920133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200460096 + 200460097.

It is an arithmetic number, because the mean of its divisors is an integer number (200460097).

Almost surely, 2^400920193 is an apocalyptic number.

It is an amenable number.

400920193 is a deficient number, since it is larger than the sum of its proper divisors (1).

400920193 is an equidigital number, since it uses as much as digits as its factorization.

400920193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 400920193 is about 20022.9916096471. The cubic root of 400920193 is about 737.3708703537.

Adding to 400920193 its reverse (391029004), we get a palindrome (791949197).

The spelling of 400920193 in words is "four hundred million, nine hundred twenty thousand, one hundred ninety-three".