128297381 has 8 divisors (see below), whose sum is σ = 134205120. Its totient is φ = 122417152.

The previous prime is 128297369. The next prime is 128297413. The reversal of 128297381 is 183792821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128297381 is a prime.

It is a super-2 number, since 2×128297381² = 32920435942918322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128297581) 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, 2981 + ... + 16293.

It is an arithmetic number, because the mean of its divisors is an integer number (16775640).

Almost surely, 2^128297381 is an apocalyptic number.

It is an amenable number.

128297381 is a deficient number, since it is larger than the sum of its proper divisors (5907739).

128297381 is a wasteful number, since it uses less digits than its factorization.

128297381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13755.

The product of its digits is 48384, while the sum is 41.

The square root of 128297381 is about 11326.8433819842. The cubic root of 128297381 is about 504.3584062027.

The spelling of 128297381 in words is "one hundred twenty-eight million, two hundred ninety-seven thousand, three hundred eighty-one".