100440665 has 8 divisors (see below), whose sum is σ = 129800328. Its totient is φ = 74171520.

The previous prime is 100440653. The next prime is 100440667. The reversal of 100440665 is 566044001.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 120409 + 100320256 = 347^2 + 10016^2 .

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

It is not a de Polignac number, because 100440665 - 2⁴ = 100440649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100440667) 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, 772556 + ... + 772685.

It is an arithmetic number, because the mean of its divisors is an integer number (16225041).

Almost surely, 2^100440665 is an apocalyptic number.

It is an amenable number.

100440665 is a deficient number, since it is larger than the sum of its proper divisors (29359663).

100440665 is a wasteful number, since it uses less digits than its factorization.

100440665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545259.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 100440665 is about 10022.0090301296. The cubic root of 100440665 is about 464.8396795760.

Adding to 100440665 its reverse (566044001), we get a palindrome (666484666).

The spelling of 100440665 in words is "one hundred million, four hundred forty thousand, six hundred sixty-five".