400242097 has 2 divisors, whose sum is σ = 400242098. Its totient is φ = 400242096.

The previous prime is 400242071. The next prime is 400242103. The reversal of 400242097 is 790242004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329749281 + 70492816 = 18159^2 + 8396^2 .

It is a cyclic number.

It is not a de Polignac number, because 400242097 - 2⁷ = 400241969 is a prime.

It is not a weakly prime, because it can be changed into another prime (400242047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200121048 + 200121049.

It is an arithmetic number, because the mean of its divisors is an integer number (200121049).

Almost surely, 2^400242097 is an apocalyptic number.

It is an amenable number.

400242097 is a deficient number, since it is larger than the sum of its proper divisors (1).

400242097 is an equidigital number, since it uses as much as digits as its factorization.

400242097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 400242097 is about 20006.0515094808. The cubic root of 400242097 is about 736.9549185776.

The spelling of 400242097 in words is "four hundred million, two hundred forty-two thousand, ninety-seven".