128401811 has 8 divisors (see below), whose sum is σ = 129702384. Its totient is φ = 127108000.

The previous prime is 128401807. The next prime is 128401831. The reversal of 128401811 is 118104821.

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 128401811 - 2² = 128401807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128401831) 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, 41945 + ... + 44901.

It is an arithmetic number, because the mean of its divisors is an integer number (16212798).

Almost surely, 2^128401811 is an apocalyptic number.

128401811 is a deficient number, since it is larger than the sum of its proper divisors (1300573).

128401811 is a wasteful number, since it uses less digits than its factorization.

128401811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381.

The product of its (nonzero) digits is 512, while the sum is 26.

The square root of 128401811 is about 11331.4522899759. The cubic root of 128401811 is about 504.4952130074.

The spelling of 128401811 in words is "one hundred twenty-eight million, four hundred one thousand, eight hundred eleven".