128420047 has 8 divisors (see below), whose sum is σ = 147397536. Its totient is φ = 109600512.

The previous prime is 128420041. The next prime is 128420053. The reversal of 128420047 is 740024821.

It is an interprime number because it is at equal distance from previous prime (128420041) and next prime (128420053).

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

It is not a de Polignac number, because 128420047 - 2¹¹ = 128417999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128419997 and 128420024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128420041) 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, 37738 + ... + 40999.

It is an arithmetic number, because the mean of its divisors is an integer number (18424692).

Almost surely, 2^128420047 is an apocalyptic number.

128420047 is a deficient number, since it is larger than the sum of its proper divisors (18977489).

128420047 is an equidigital number, since it uses as much as digits as its factorization.

128420047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78977.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 128420047 is about 11332.2569243730. The cubic root of 128420047 is about 504.5190951711.

Adding to 128420047 its reverse (740024821), we get a palindrome (868444868).

The spelling of 128420047 in words is "one hundred twenty-eight million, four hundred twenty thousand, forty-seven".