400043701 has 2 divisors, whose sum is σ = 400043702. Its totient is φ = 400043700.

The previous prime is 400043687. The next prime is 400043731. The reversal of 400043701 is 107340004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375778225 + 24265476 = 19385^2 + 4926^2 .

It is a cyclic number.

It is not a de Polignac number, because 400043701 - 2⁷ = 400043573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400043731) 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 as a sum of consecutive naturals, namely, 200021850 + 200021851.

It is an arithmetic number, because the mean of its divisors is an integer number (200021851).

Almost surely, 2^400043701 is an apocalyptic number.

It is an amenable number.

400043701 is a deficient number, since it is larger than the sum of its proper divisors (1).

400043701 is an equidigital number, since it uses as much as digits as its factorization.

400043701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 400043701 is about 20001.0924951614. The cubic root of 400043701 is about 736.8331313944.

Adding to 400043701 its reverse (107340004), we get a palindrome (507383705).

The spelling of 400043701 in words is "four hundred million, forty-three thousand, seven hundred one".