128199894 has 32 divisors (see below), whose sum is σ = 272423520. Its totient is φ = 40142592.

The previous prime is 128199893. The next prime is 128199937. The reversal of 128199894 is 498991821.

It is a super-2 number, since 2×128199894² = 32870425643222472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128199893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3519 + ... + 16394.

It is an arithmetic number, because the mean of its divisors is an integer number (8513235).

Almost surely, 2^128199894 is an apocalyptic number.

128199894 is an abundant number, since it is smaller than the sum of its proper divisors (144223626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128199894 is a wasteful number, since it uses less digits than its factorization.

128199894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19984.

The product of its digits is 373248, while the sum is 51.

The square root of 128199894 is about 11322.5392028467. The cubic root of 128199894 is about 504.2306279468.

The spelling of 128199894 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, eight hundred ninety-four".