400009097 has 2 divisors, whose sum is σ = 400009098. Its totient is φ = 400009096.

The previous prime is 400009063. The next prime is 400009163. The reversal of 400009097 is 790900004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215619856 + 184389241 = 14684^2 + 13579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400009097 is a prime.

It is not a weakly prime, because it can be changed into another prime (400009397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200004548 + 200004549.

It is an arithmetic number, because the mean of its divisors is an integer number (200004549).

Almost surely, 2^400009097 is an apocalyptic number.

It is an amenable number.

400009097 is a deficient number, since it is larger than the sum of its proper divisors (1).

400009097 is an equidigital number, since it uses as much as digits as its factorization.

400009097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 400009097 is about 20000.2274237070. The cubic root of 400009097 is about 736.8118852915.

The spelling of 400009097 in words is "four hundred million, nine thousand, ninety-seven".