128497187 has 8 divisors (see below), whose sum is σ = 158150496. Its totient is φ = 101668032.

The previous prime is 128497183. The next prime is 128497217. The reversal of 128497187 is 781794821.

It is a happy number.

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 128497187 - 2² = 128497183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128497181) 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, 705938 + ... + 706119.

It is an arithmetic number, because the mean of its divisors is an integer number (19768812).

Almost surely, 2^128497187 is an apocalyptic number.

128497187 is a deficient number, since it is larger than the sum of its proper divisors (29653309).

128497187 is a wasteful number, since it uses less digits than its factorization.

128497187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412077.

The product of its digits is 225792, while the sum is 47.

The square root of 128497187 is about 11335.6599719646. The cubic root of 128497187 is about 504.6200939738.

The spelling of 128497187 in words is "one hundred twenty-eight million, four hundred ninety-seven thousand, one hundred eighty-seven".