320400497 has 8 divisors (see below), whose sum is σ = 332409000. Its totient is φ = 308456064.

The previous prime is 320400491. The next prime is 320400517. The reversal of 320400497 is 794004023.

It can be written as a sum of positive squares in 4 ways, for example, as 79405921 + 240994576 = 8911^2 + 15524^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 320400497 - 2⁶ = 320400433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320400491) 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, 5708 + ... + 25949.

It is an arithmetic number, because the mean of its divisors is an integer number (41551125).

Almost surely, 2^320400497 is an apocalyptic number.

It is an amenable number.

320400497 is a deficient number, since it is larger than the sum of its proper divisors (12008503).

320400497 is a wasteful number, since it uses less digits than its factorization.

320400497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32035.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 320400497 is about 17899.7345511044. The cubic root of 320400497 is about 684.2756098084.

The spelling of 320400497 in words is "three hundred twenty million, four hundred thousand, four hundred ninety-seven".