128340377 has 4 divisors (see below), whose sum is σ = 140007696. Its totient is φ = 116673060.

The previous prime is 128340347. The next prime is 128340389. The reversal of 128340377 is 773043821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128340377 - 2⁶ = 128340313 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (128340347) 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, 5833643 + ... + 5833664.

It is an arithmetic number, because the mean of its divisors is an integer number (35001924).

Almost surely, 2^128340377 is an apocalyptic number.

It is an amenable number.

128340377 is a deficient number, since it is larger than the sum of its proper divisors (11667319).

128340377 is a wasteful number, since it uses less digits than its factorization.

128340377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11667318.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 128340377 is about 11328.7411922067. The cubic root of 128340377 is about 504.4147413928.

The spelling of 128340377 in words is "one hundred twenty-eight million, three hundred forty thousand, three hundred seventy-seven".