100720401 has 8 divisors (see below), whose sum is σ = 137923584. Its totient is φ = 65332080.

The previous prime is 100720391. The next prime is 100720409. The reversal of 100720401 is 104027001.

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

It is not a de Polignac number, because 100720401 - 2⁵ = 100720369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100720409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453585 + ... + 453806.

It is an arithmetic number, because the mean of its divisors is an integer number (17240448).

Almost surely, 2^100720401 is an apocalyptic number.

It is an amenable number.

100720401 is a deficient number, since it is larger than the sum of its proper divisors (37203183).

100720401 is an equidigital number, since it uses as much as digits as its factorization.

100720401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907431.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 100720401 is about 10035.9554104231. The cubic root of 100720401 is about 465.2708192339.

Adding to 100720401 its reverse (104027001), we get a palindrome (204747402).

The spelling of 100720401 in words is "one hundred million, seven hundred twenty thousand, four hundred one".