128418427 has 4 divisors (see below), whose sum is σ = 128446816. Its totient is φ = 128390040.

The previous prime is 128418421. The next prime is 128418439. The reversal of 128418427 is 724814821.

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: 724814821 = 149 ⋅4864529.

It is a cyclic number.

It is not a de Polignac number, because 128418427 - 2⁷ = 128418299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128418421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5724 + ... + 17017.

It is an arithmetic number, because the mean of its divisors is an integer number (32111704).

Almost surely, 2^128418427 is an apocalyptic number.

128418427 is a deficient number, since it is larger than the sum of its proper divisors (28389).

128418427 is an equidigital number, since it uses as much as digits as its factorization.

128418427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28388.

The product of its digits is 28672, while the sum is 37.

The square root of 128418427 is about 11332.1854467706. The cubic root of 128418427 is about 504.5169736841.

The spelling of 128418427 in words is "one hundred twenty-eight million, four hundred eighteen thousand, four hundred twenty-seven".