400430941 has 2 divisors, whose sum is σ = 400430942. Its totient is φ = 400430940.

The previous prime is 400430939. The next prime is 400431049. The reversal of 400430941 is 149034004.

It is a happy number.

Together with next prime (400431049) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374267716 + 26163225 = 19346^2 + 5115^2 .

It is a cyclic number.

It is not a de Polignac number, because 400430941 - 2¹ = 400430939 is a prime.

Together with 400430939, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400430911) 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 as a sum of consecutive naturals, namely, 200215470 + 200215471.

It is an arithmetic number, because the mean of its divisors is an integer number (200215471).

Almost surely, 2^400430941 is an apocalyptic number.

It is an amenable number.

400430941 is a deficient number, since it is larger than the sum of its proper divisors (1).

400430941 is an equidigital number, since it uses as much as digits as its factorization.

400430941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 400430941 is about 20010.7706248410. The cubic root of 400430941 is about 737.0708047987.

Adding to 400430941 its reverse (149034004), we get a palindrome (549464945).

The spelling of 400430941 in words is "four hundred million, four hundred thirty thousand, nine hundred forty-one".