400766393 has 2 divisors, whose sum is σ = 400766394. Its totient is φ = 400766392.

The previous prime is 400766389. The next prime is 400766441. The reversal of 400766393 is 393667004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335915584 + 64850809 = 18328^2 + 8053^2 .

It is a cyclic number.

It is not a de Polignac number, because 400766393 - 2² = 400766389 is a prime.

It is a super-2 number, since 2×400766393² = 321227403516460898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400766363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200383196 + 200383197.

It is an arithmetic number, because the mean of its divisors is an integer number (200383197).

Almost surely, 2^400766393 is an apocalyptic number.

It is an amenable number.

400766393 is a deficient number, since it is larger than the sum of its proper divisors (1).

400766393 is an equidigital number, since it uses as much as digits as its factorization.

400766393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 400766393 is about 20019.1506563091. The cubic root of 400766393 is about 737.2765688388.

The spelling of 400766393 in words is "four hundred million, seven hundred sixty-six thousand, three hundred ninety-three".