128377 has 2 divisors, whose sum is σ = 128378. Its totient is φ = 128376.

The previous prime is 128351. The next prime is 128389. The reversal of 128377 is 773821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114921 + 13456 = 339^2 + 116^2 .

It is an emirp because it is prime and its reverse (773821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64188 + 64189.

It is an arithmetic number, because the mean of its divisors is an integer number (64189).

2¹²⁸³⁷⁷ is an apocalyptic number.

It is an amenable number.

128377 is a deficient number, since it is larger than the sum of its proper divisors (1).

128377 is an equidigital number, since it uses as much as digits as its factorization.

128377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 28.

The square root of 128377 is about 358.2973625356. The cubic root of 128377 is about 50.4462716485.

Subtracting from 128377 its product of digits (2352), we obtain a square (126025 = 355²).

It can be divided in two parts, 128 and 377, that added together give a palindrome (505).

The spelling of 128377 in words is "one hundred twenty-eight thousand, three hundred seventy-seven".