139408187 has 8 divisors (see below), whose sum is σ = 146986560. Its totient is φ = 131853960.

The previous prime is 139408169. The next prime is 139408189. The reversal of 139408187 is 781804931.

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 139408187 - 2⁶ = 139408123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139408189) 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, 6512 + ... + 17922.

It is an arithmetic number, because the mean of its divisors is an integer number (18373320).

Almost surely, 2^139408187 is an apocalyptic number.

139408187 is a deficient number, since it is larger than the sum of its proper divisors (7578373).

139408187 is a wasteful number, since it uses less digits than its factorization.

139408187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12073.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 139408187 is about 11807.1244170628. The cubic root of 139408187 is about 518.5167135690.

The spelling of 139408187 in words is "one hundred thirty-nine million, four hundred eight thousand, one hundred eighty-seven".