102440405 has 8 divisors (see below), whose sum is σ = 125787552. Its totient is φ = 80046288.

The previous prime is 102440369. The next prime is 102440407. The reversal of 102440405 is 504044201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102440405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102440407) 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, 238019 + ... + 238448.

It is an arithmetic number, because the mean of its divisors is an integer number (15723444).

Almost surely, 2^102440405 is an apocalyptic number.

It is an amenable number.

102440405 is a deficient number, since it is larger than the sum of its proper divisors (23347147).

102440405 is an equidigital number, since it uses as much as digits as its factorization.

102440405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476515.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 102440405 is about 10121.2847504652. The cubic root of 102440405 is about 467.9043638437.

Adding to 102440405 its reverse (504044201), we get a palindrome (606484606).

The spelling of 102440405 in words is "one hundred two million, four hundred forty thousand, four hundred five".