400390099 has 2 divisors, whose sum is σ = 400390100. Its totient is φ = 400390098.

The previous prime is 400390093. The next prime is 400390117. The reversal of 400390099 is 990093004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400390099 - 2⁷ = 400389971 is a prime.

It is not a weakly prime, because it can be changed into another prime (400390093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200195049 + 200195050.

It is an arithmetic number, because the mean of its divisors is an integer number (200195050).

Almost surely, 2^400390099 is an apocalyptic number.

400390099 is a deficient number, since it is larger than the sum of its proper divisors (1).

400390099 is an equidigital number, since it uses as much as digits as its factorization.

400390099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 400390099 is about 20009.7500983895. The cubic root of 400390099 is about 737.0457447395.

The spelling of 400390099 in words is "four hundred million, three hundred ninety thousand, ninety-nine".