139678889 has 8 divisors (see below), whose sum is σ = 159884928. Its totient is φ = 119535840.

The previous prime is 139678883. The next prime is 139678909. The reversal of 139678889 is 988876931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139678889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139678883) 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, 10892 + ... + 19949.

It is an arithmetic number, because the mean of its divisors is an integer number (19985616).

Almost surely, 2^139678889 is an apocalyptic number.

It is an amenable number.

139678889 is a deficient number, since it is larger than the sum of its proper divisors (20206039).

139678889 is an equidigital number, since it uses as much as digits as its factorization.

139678889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31495.

The product of its digits is 5225472, while the sum is 59.

The square root of 139678889 is about 11818.5823599956. The cubic root of 139678889 is about 518.8521141409.

The spelling of 139678889 in words is "one hundred thirty-nine million, six hundred seventy-eight thousand, eight hundred eighty-nine".