320400145 has 8 divisors (see below), whose sum is σ = 414055656. Its totient is φ = 236603136.

The previous prime is 320400137. The next prime is 320400151. The reversal of 320400145 is 541004023.

It can be written as a sum of positive squares in 4 ways, for example, as 1527696 + 318872449 = 1236^2 + 17857^2 .

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 320400145 - 2³ = 320400137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2464552 + ... + 2464681.

It is an arithmetic number, because the mean of its divisors is an integer number (51756957).

Almost surely, 2^320400145 is an apocalyptic number.

It is an amenable number.

320400145 is a deficient number, since it is larger than the sum of its proper divisors (93655511).

320400145 is a wasteful number, since it uses less digits than its factorization.

320400145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4929251.

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

The square root of 320400145 is about 17899.7247185536. The cubic root of 320400145 is about 684.2753592209.

Adding to 320400145 its reverse (541004023), we get a palindrome (861404168).

The spelling of 320400145 in words is "three hundred twenty million, four hundred thousand, one hundred forty-five".