400410421 has 4 divisors (see below), whose sum is σ = 401114700. Its totient is φ = 399706144.

The previous prime is 400410397. The next prime is 400410443. The reversal of 400410421 is 124014004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 81252196 + 319158225 = 9014^2 + 17865^2 .

It is a cyclic number.

It is not a de Polignac number, because 400410421 - 2⁹ = 400409909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400410395 and 400410404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400410481) 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 3 ways as a sum of consecutive naturals, for example, 351286 + ... + 352423.

It is an arithmetic number, because the mean of its divisors is an integer number (100278675).

Almost surely, 2^400410421 is an apocalyptic number.

It is an amenable number.

400410421 is a deficient number, since it is larger than the sum of its proper divisors (704279).

400410421 is an equidigital number, since it uses as much as digits as its factorization.

400410421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704278.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 400410421 is about 20010.2578943901. The cubic root of 400410421 is about 737.0582142372.

Adding to 400410421 its reverse (124014004), we get a palindrome (524424425).

The spelling of 400410421 in words is "four hundred million, four hundred ten thousand, four hundred twenty-one".