400420666406 has 4 divisors (see below), whose sum is σ = 600630999612. Its totient is φ = 200210333202.

The previous prime is 400420666369. The next prime is 400420666411. The reversal of 400420666406 is 604666024004.

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

It is a self number, because there is not a number n which added to its sum of digits gives 400420666406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100105166600 + ... + 100105166603.

It is an arithmetic number, because the mean of its divisors is an integer number (150157749903).

Almost surely, 2^400420666406 is an apocalyptic number.

400420666406 is a deficient number, since it is larger than the sum of its proper divisors (200210333206).

400420666406 is a wasteful number, since it uses less digits than its factorization.

400420666406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200210333205.

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 400420666406 in words is "four hundred billion, four hundred twenty million, six hundred sixty-six thousand, four hundred six".