400766191 has 16 divisors (see below), whose sum is σ = 478706688. Its totient is φ = 328046400.

The previous prime is 400766189. The next prime is 400766213. The reversal of 400766191 is 191667004.

It is a cyclic number.

It is not a de Polignac number, because 400766191 - 2¹ = 400766189 is a prime.

It is a super-2 number, since 2×400766191² = 321227079697296962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400766101) 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 15 ways as a sum of consecutive naturals, for example, 120886 + ... + 124156.

It is an arithmetic number, because the mean of its divisors is an integer number (29919168).

Almost surely, 2^400766191 is an apocalyptic number.

400766191 is a deficient number, since it is larger than the sum of its proper divisors (77940497).

400766191 is a wasteful number, since it uses less digits than its factorization.

400766191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4062.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 400766191 is about 20019.1456111394. The cubic root of 400766191 is about 737.2764449679.

The spelling of 400766191 in words is "four hundred million, seven hundred sixty-six thousand, one hundred ninety-one".