400831943 has 4 divisors (see below), whose sum is σ = 400932480. Its totient is φ = 400731408.

The previous prime is 400831931. The next prime is 400831979. The reversal of 400831943 is 349138004.

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

It is a cyclic number.

It is not a de Polignac number, because 400831943 - 2⁴ = 400831927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400831993) 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 3 ways as a sum of consecutive naturals, for example, 44030 + ... + 52347.

It is an arithmetic number, because the mean of its divisors is an integer number (100233120).

Almost surely, 2^400831943 is an apocalyptic number.

400831943 is a deficient number, since it is larger than the sum of its proper divisors (100537).

400831943 is an equidigital number, since it uses as much as digits as its factorization.

400831943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100536.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 400831943 is about 20020.7877717137. The cubic root of 400831943 is about 737.3167633638.

Adding to 400831943 its reverse (349138004), we get a palindrome (749969947).

The spelling of 400831943 in words is "four hundred million, eight hundred thirty-one thousand, nine hundred forty-three".