128939862 has 8 divisors (see below), whose sum is σ = 257879736. Its totient is φ = 42979952.

The previous prime is 128939821. The next prime is 128939873. The reversal of 128939862 is 268939821.

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

128939862 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10744983 + ... + 10744994.

It is an arithmetic number, because the mean of its divisors is an integer number (32234967).

Almost surely, 2^128939862 is an apocalyptic number.

128939862 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128939862 is a wasteful number, since it uses less digits than its factorization.

128939862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21489982.

The product of its digits is 373248, while the sum is 48.

The square root of 128939862 is about 11355.1689551499. The cubic root of 128939862 is about 505.1989047532.

The spelling of 128939862 in words is "one hundred twenty-eight million, nine hundred thirty-nine thousand, eight hundred sixty-two".