128942977 has 8 divisors (see below), whose sum is σ = 137434752. Its totient is φ = 120552000.

The previous prime is 128942969. The next prime is 128942999. The reversal of 128942977 is 779249821.

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 128942977 - 2³ = 128942969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128942977.

It is not an unprimeable number, because it can be changed into a prime (128942927) 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, 22549 + ... + 27682.

It is an arithmetic number, because the mean of its divisors is an integer number (17179344).

Almost surely, 2^128942977 is an apocalyptic number.

128942977 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128942977 is a deficient number, since it is larger than the sum of its proper divisors (8491775).

128942977 is a wasteful number, since it uses less digits than its factorization.

128942977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50399.

The product of its digits is 508032, while the sum is 49.

The square root of 128942977 is about 11355.3061165254. The cubic root of 128942977 is about 505.2029730113.

The spelling of 128942977 in words is "one hundred twenty-eight million, nine hundred forty-two thousand, nine hundred seventy-seven".