400320345 has 16 divisors (see below), whose sum is σ = 641044800. Its totient is φ = 213326784.

The previous prime is 400320341. The next prime is 400320373. The reversal of 400320345 is 543023004.

It is a happy number.

It is not a de Polignac number, because 400320345 - 2² = 400320341 is a prime.

It is a super-3 number, since 3×400320345³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (400320341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8706 + ... + 29604.

It is an arithmetic number, because the mean of its divisors is an integer number (40065300).

Almost surely, 2^400320345 is an apocalyptic number.

It is an amenable number.

400320345 is a deficient number, since it is larger than the sum of its proper divisors (240724455).

400320345 is a wasteful number, since it uses less digits than its factorization.

400320345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22184.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 400320345 is about 20008.0070221899. The cubic root of 400320345 is about 737.0029407550.

Adding to 400320345 its reverse (543023004), we get a palindrome (943343349).

The spelling of 400320345 in words is "four hundred million, three hundred twenty thousand, three hundred forty-five".