400343971 has 8 divisors (see below), whose sum is σ = 406241280. Its totient is φ = 394488192.

The previous prime is 400343941. The next prime is 400343987. The reversal of 400343971 is 179343004.

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 400343971 - 2⁵ = 400343939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400343921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9310 + ... + 29788.

It is an arithmetic number, because the mean of its divisors is an integer number (50780160).

Almost surely, 2^400343971 is an apocalyptic number.

400343971 is a deficient number, since it is larger than the sum of its proper divisors (5897309).

400343971 is a wasteful number, since it uses less digits than its factorization.

400343971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20765.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 400343971 is about 20008.5974271062. The cubic root of 400343971 is about 737.0174392179.

Adding to 400343971 its reverse (179343004), we get a palindrome (579686975).

It can be divided in two parts, 4003 and 43971, that added together give a palindrome (47974).

The spelling of 400343971 in words is "four hundred million, three hundred forty-three thousand, nine hundred seventy-one".