139255989 has 16 divisors (see below), whose sum is σ = 191116800. Its totient is φ = 90154736.

The previous prime is 139255981. The next prime is 139256009. The reversal of 139255989 is 989552931.

It is a cyclic number.

It is not a de Polignac number, because 139255989 - 2³ = 139255981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139255981) 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, 9952 + ... + 19430.

It is an arithmetic number, because the mean of its divisors is an integer number (11944800).

Almost surely, 2^139255989 is an apocalyptic number.

It is an amenable number.

139255989 is a deficient number, since it is larger than the sum of its proper divisors (51860811).

139255989 is an equidigital number, since it uses as much as digits as its factorization.

139255989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9624.

The product of its digits is 874800, while the sum is 51.

The square root of 139255989 is about 11800.6774805517. The cubic root of 139255989 is about 518.3279490853.

The spelling of 139255989 in words is "one hundred thirty-nine million, two hundred fifty-five thousand, nine hundred eighty-nine".