128839492 has 12 divisors (see below), whose sum is σ = 226328256. Its totient is φ = 64174280.

The previous prime is 128839483. The next prime is 128839493. The reversal of 128839492 is 294938821.

It is a super-2 number, since 2×128839492² = 33199229397636128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128839493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60184 + ... + 62287.

It is an arithmetic number, because the mean of its divisors is an integer number (18860688).

Almost surely, 2^128839492 is an apocalyptic number.

It is an amenable number.

128839492 is a deficient number, since it is larger than the sum of its proper divisors (97488764).

128839492 is a wasteful number, since it uses less digits than its factorization.

128839492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122738 (or 122736 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The square root of 128839492 is about 11350.7485215734. The cubic root of 128839492 is about 505.0677842548.

The spelling of 128839492 in words is "one hundred twenty-eight million, eight hundred thirty-nine thousand, four hundred ninety-two".