102420445 has 8 divisors (see below), whose sum is σ = 123049944. Its totient is φ = 81839424.

The previous prime is 102420443. The next prime is 102420467. The reversal of 102420445 is 544024201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 40373316 + 62047129 = 6354^2 + 7877^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 102420445 - 2¹ = 102420443 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 (102420443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7294 + ... + 16063.

It is an arithmetic number, because the mean of its divisors is an integer number (15381243).

Almost surely, 2^102420445 is an apocalyptic number.

It is an amenable number.

102420445 is a deficient number, since it is larger than the sum of its proper divisors (20629499).

102420445 is an equidigital number, since it uses as much as digits as its factorization.

102420445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24239.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 102420445 is about 10120.2986616009. The cubic root of 102420445 is about 467.8739722622.

Adding to 102420445 its reverse (544024201), we get a palindrome (646444646).

The spelling of 102420445 in words is "one hundred two million, four hundred twenty thousand, four hundred forty-five".