400030321 has 4 divisors (see below), whose sum is σ = 413824500. Its totient is φ = 386236144.

The previous prime is 400030303. The next prime is 400030339. The reversal of 400030321 is 123030004.

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

It is an interprime number because it is at equal distance from previous prime (400030303) and next prime (400030339).

It can be written as a sum of positive squares in 2 ways, for example, as 191545600 + 208484721 = 13840^2 + 14439^2 .

It is a cyclic number.

It is not a de Polignac number, because 400030321 - 2⁵ = 400030289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400030391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6897046 + ... + 6897103.

It is an arithmetic number, because the mean of its divisors is an integer number (103456125).

Almost surely, 2^400030321 is an apocalyptic number.

It is an amenable number.

400030321 is a deficient number, since it is larger than the sum of its proper divisors (13794179).

400030321 is a wasteful number, since it uses less digits than its factorization.

400030321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13794178.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 400030321 is about 20000.7580106355. The cubic root of 400030321 is about 736.8249165109.

Adding to 400030321 its reverse (123030004), we get a palindrome (523060325).

The spelling of 400030321 in words is "four hundred million, thirty thousand, three hundred twenty-one".