102440005 has 4 divisors (see below), whose sum is σ = 122928012. Its totient is φ = 81952000.

The previous prime is 102439991. The next prime is 102440021. The reversal of 102440005 is 500044201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46594276 + 55845729 = 6826^2 + 7473^2 .

It is not a de Polignac number, because 102440005 - 2²⁵ = 68885573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10243996 + ... + 10244005.

It is an arithmetic number, because the mean of its divisors is an integer number (30732003).

Almost surely, 2^102440005 is an apocalyptic number.

It is an amenable number.

102440005 is a deficient number, since it is larger than the sum of its proper divisors (20488007).

102440005 is an equidigital number, since it uses as much as digits as its factorization.

102440005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20488006.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 102440005 is about 10121.2649901087. The cubic root of 102440005 is about 467.9037548327.

Adding to 102440005 its reverse (500044201), we get a palindrome (602484206).

The spelling of 102440005 in words is "one hundred two million, four hundred forty thousand, five".