139289887 has 8 divisors (see below), whose sum is σ = 153429120. Its totient is φ = 125396760.

The previous prime is 139289881. The next prime is 139289897. The reversal of 139289887 is 788982931.

139289887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 139289887 - 2³ = 139289879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139289881) 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, 60337 + ... + 62602.

It is an arithmetic number, because the mean of its divisors is an integer number (19178640).

Almost surely, 2^139289887 is an apocalyptic number.

139289887 is a deficient number, since it is larger than the sum of its proper divisors (14139233).

139289887 is a wasteful number, since it uses less digits than its factorization.

139289887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123053.

The product of its digits is 1741824, while the sum is 55.

The square root of 139289887 is about 11802.1136666277. The cubic root of 139289887 is about 518.3700031841.

The spelling of 139289887 in words is "one hundred thirty-nine million, two hundred eighty-nine thousand, eight hundred eighty-seven".