100320405 has 8 divisors (see below), whose sum is σ = 160512672. Its totient is φ = 53504208.

The previous prime is 100320403. The next prime is 100320413. The reversal of 100320405 is 504023001.

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

It is not a de Polignac number, because 100320405 - 2¹ = 100320403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 6688027 = 100320405 / (1 + 0 + 0 + 3 + 2 + 0 + 4 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100320401) 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, 3343999 + ... + 3344028.

It is an arithmetic number, because the mean of its divisors is an integer number (20064084).

Almost surely, 2^100320405 is an apocalyptic number.

100320405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100320405 is a deficient number, since it is larger than the sum of its proper divisors (60192267).

100320405 is an equidigital number, since it uses as much as digits as its factorization.

100320405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6688035.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 100320405 is about 10016.0074380963. The cubic root of 100320405 is about 464.6540842778.

Adding to 100320405 its reverse (504023001), we get a palindrome (604343406).

The spelling of 100320405 in words is "one hundred million, three hundred twenty thousand, four hundred five".