400406667667 has 4 divisors (see below), whose sum is σ = 409718450680. Its totient is φ = 391094884656.

The previous prime is 400406667643. The next prime is 400406667691. The reversal of 400406667667 is 766766604004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (400406667643) and next prime (400406667691).

It is a cyclic number.

It is not a de Polignac number, because 400406667667 - 2³⁵ = 366046929299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400406667607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4655891442 + ... + 4655891527.

It is an arithmetic number, because the mean of its divisors is an integer number (102429612670).

Almost surely, 2^400406667667 is an apocalyptic number.

400406667667 is a deficient number, since it is larger than the sum of its proper divisors (9311783013).

400406667667 is an equidigital number, since it uses as much as digits as its factorization.

400406667667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9311783012.

The product of its (nonzero) digits is 6096384, while the sum is 52.

The spelling of 400406667667 in words is "four hundred billion, four hundred six million, six hundred sixty-seven thousand, six hundred sixty-seven".