320403401 has 2 divisors, whose sum is σ = 320403402. Its totient is φ = 320403400.

The previous prime is 320403379. The next prime is 320403431. The reversal of 320403401 is 104304023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262278025 + 58125376 = 16195^2 + 7624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320403401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320403401.

It is not a weakly prime, because it can be changed into another prime (320403431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160201700 + 160201701.

It is an arithmetic number, because the mean of its divisors is an integer number (160201701).

Almost surely, 2^320403401 is an apocalyptic number.

It is an amenable number.

320403401 is a deficient number, since it is larger than the sum of its proper divisors (1).

320403401 is an equidigital number, since it uses as much as digits as its factorization.

320403401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 320403401 is about 17899.8156694420. The cubic root of 320403401 is about 684.2776771485.

Adding to 320403401 its reverse (104304023), we get a palindrome (424707424).

The spelling of 320403401 in words is "three hundred twenty million, four hundred three thousand, four hundred one".