400308091 has 2 divisors, whose sum is σ = 400308092. Its totient is φ = 400308090.

The previous prime is 400308043. The next prime is 400308101. The reversal of 400308091 is 190803004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400308091 - 2¹¹ = 400306043 is a prime.

It is not a weakly prime, because it can be changed into another prime (400308791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200154045 + 200154046.

It is an arithmetic number, because the mean of its divisors is an integer number (200154046).

Almost surely, 2^400308091 is an apocalyptic number.

400308091 is a deficient number, since it is larger than the sum of its proper divisors (1).

400308091 is an equidigital number, since it uses as much as digits as its factorization.

400308091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 400308091 is about 20007.7007924449. The cubic root of 400308091 is about 736.9954206724.

The spelling of 400308091 in words is "four hundred million, three hundred eight thousand, ninety-one".