400006667 has 8 divisors (see below), whose sum is σ = 411182496. Its totient is φ = 388850112.

The previous prime is 400006643. The next prime is 400006669. The reversal of 400006667 is 766600004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400006667 - 2⁶ = 400006603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400006669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44063 + ... + 52359.

It is an arithmetic number, because the mean of its divisors is an integer number (51397812).

Almost surely, 2^400006667 is an apocalyptic number.

400006667 is a deficient number, since it is larger than the sum of its proper divisors (11175829).

400006667 is a wasteful number, since it uses less digits than its factorization.

400006667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9637.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 400006667 is about 20000.1666743055. The cubic root of 400006667 is about 736.8103932783.

The spelling of 400006667 in words is "four hundred million, six thousand, six hundred sixty-seven".