400530421 has 8 divisors (see below), whose sum is σ = 427846104. Its totient is φ = 373632000.

The previous prime is 400530413. The next prime is 400530457. The reversal of 400530421 is 124035004.

It can be written as a sum of positive squares in 4 ways, for example, as 9084196 + 391446225 = 3014^2 + 19785^2 .

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 400530421 - 2³ = 400530413 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 (400530401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102330 + ... + 106171.

It is an arithmetic number, because the mean of its divisors is an integer number (53480763).

Almost surely, 2^400530421 is an apocalyptic number.

It is an amenable number.

400530421 is a deficient number, since it is larger than the sum of its proper divisors (27315683).

400530421 is a wasteful number, since it uses less digits than its factorization.

400530421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208631.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 400530421 is about 20013.2561318742. The cubic root of 400530421 is about 737.1318371558.

Adding to 400530421 its reverse (124035004), we get a palindrome (524565425).

The spelling of 400530421 in words is "four hundred million, five hundred thirty thousand, four hundred twenty-one".