100040645 has 4 divisors (see below), whose sum is σ = 120048780. Its totient is φ = 80032512.

The previous prime is 100040641. The next prime is 100040653. The reversal of 100040645 is 546040001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546040001 = 13 ⋅42003077.

It can be written as a sum of positive squares in 2 ways, for example, as 79673476 + 20367169 = 8926^2 + 4513^2 .

It is a cyclic number.

It is not a de Polignac number, because 100040645 - 2² = 100040641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100040641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10004060 + ... + 10004069.

It is an arithmetic number, because the mean of its divisors is an integer number (30012195).

Almost surely, 2^100040645 is an apocalyptic number.

It is an amenable number.

100040645 is a deficient number, since it is larger than the sum of its proper divisors (20008135).

100040645 is an equidigital number, since it uses as much as digits as its factorization.

100040645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20008134.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 100040645 is about 10002.0320435400. The cubic root of 100040645 is about 464.2217606359.

Adding to 100040645 its reverse (546040001), we get a palindrome (646080646).

The spelling of 100040645 in words is "one hundred million, forty thousand, six hundred forty-five".