788889139 has 4 divisors (see below), whose sum is σ = 830409640. Its totient is φ = 747368640.

The previous prime is 788889109. The next prime is 788889161. The reversal of 788889139 is 931988887.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 788889139 - 2⁷ = 788889011 is a prime.

It is a super-2 number, since 2×788889139² = 1244692147264322642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (788889109) 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, 20760222 + ... + 20760259.

It is an arithmetic number, because the mean of its divisors is an integer number (207602410).

Almost surely, 2^788889139 is an apocalyptic number.

788889139 is a deficient number, since it is larger than the sum of its proper divisors (41520501).

788889139 is a wasteful number, since it uses less digits than its factorization.

788889139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41520500.

The product of its digits is 6967296, while the sum is 61.

The square root of 788889139 is about 28087.1703629967. The cubic root of 788889139 is about 924.0000448986. Note that the first 4 decimals are identical.

The spelling of 788889139 in words is "seven hundred eighty-eight million, eight hundred eighty-nine thousand, one hundred thirty-nine".