400806697 has 2 divisors, whose sum is σ = 400806698. Its totient is φ = 400806696.

The previous prime is 400806689. The next prime is 400806733. The reversal of 400806697 is 796608004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 336502336 + 64304361 = 18344^2 + 8019^2 .

It is a cyclic number.

It is not a de Polignac number, because 400806697 - 2³ = 400806689 is a prime.

It is not a weakly prime, because it can be changed into another prime (400806667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200403348 + 200403349.

It is an arithmetic number, because the mean of its divisors is an integer number (200403349).

Almost surely, 2^400806697 is an apocalyptic number.

It is an amenable number.

400806697 is a deficient number, since it is larger than the sum of its proper divisors (1).

400806697 is an equidigital number, since it uses as much as digits as its factorization.

400806697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 400806697 is about 20020.1572671146. The cubic root of 400806697 is about 737.3012833185.

The spelling of 400806697 in words is "four hundred million, eight hundred six thousand, six hundred ninety-seven".