100720449 has 8 divisors (see below), whose sum is σ = 149215520. Its totient is φ = 67146948.

The previous prime is 100720447. The next prime is 100720453. The reversal of 100720449 is 944027001.

It is a happy number.

It is not a de Polignac number, because 100720449 - 2¹ = 100720447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 3730387 = 100720449 / (1 + 0 + 0 + 7 + 2 + 0 + 4 + 4 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100720441) 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, 1865167 + ... + 1865220.

It is an arithmetic number, because the mean of its divisors is an integer number (18651940).

Almost surely, 2^100720449 is an apocalyptic number.

It is an amenable number.

100720449 is a deficient number, since it is larger than the sum of its proper divisors (48495071).

100720449 is an equidigital number, since it uses as much as digits as its factorization.

100720449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3730396 (or 3730390 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 100720449 is about 10035.9578018244. The cubic root of 100720449 is about 465.2708931448.

The spelling of 100720449 in words is "one hundred million, seven hundred twenty thousand, four hundred forty-nine".