406776667 has 4 divisors (see below), whose sum is σ = 443756376. Its totient is φ = 369796960.

The previous prime is 406776647. The next prime is 406776673. The reversal of 406776667 is 766677604.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406776667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 406776667.

It is not an unprimeable number, because it can be changed into a prime (406776607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18489838 + ... + 18489859.

It is an arithmetic number, because the mean of its divisors is an integer number (110939094).

Almost surely, 2^406776667 is an apocalyptic number.

406776667 is a deficient number, since it is larger than the sum of its proper divisors (36979709).

406776667 is a wasteful number, since it uses less digits than its factorization.

406776667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36979708.

The product of its (nonzero) digits is 1778112, while the sum is 49.

The square root of 406776667 is about 20168.7051393985. The cubic root of 406776667 is about 740.9439299553.

The spelling of 406776667 in words is "four hundred six million, seven hundred seventy-six thousand, six hundred sixty-seven".