128369381 has 8 divisors (see below), whose sum is σ = 147477504. Its totient is φ = 109453680.

The previous prime is 128369369. The next prime is 128369383. The reversal of 128369381 is 183963821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128369381 - 2¹⁴ = 128352997 is a prime.

It is a super-2 number, since 2×128369381² = 32957395956646322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128369383) 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, 46670 + ... + 49343.

It is an arithmetic number, because the mean of its divisors is an integer number (18434688).

Almost surely, 2^128369381 is an apocalyptic number.

It is an amenable number.

128369381 is a deficient number, since it is larger than the sum of its proper divisors (19108123).

128369381 is an equidigital number, since it uses as much as digits as its factorization.

128369381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96211.

The product of its digits is 62208, while the sum is 41.

The square root of 128369381 is about 11330.0212268115. The cubic root of 128369381 is about 504.4527365625.

The spelling of 128369381 in words is "one hundred twenty-eight million, three hundred sixty-nine thousand, three hundred eighty-one".