139470987 has 4 divisors (see below), whose sum is σ = 185961320. Its totient is φ = 92980656.

The previous prime is 139470983. The next prime is 139471027. The reversal of 139470987 is 789074931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789074931 = 3 ⋅263024977.

It is not a de Polignac number, because 139470987 - 2² = 139470983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139470983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23245162 + ... + 23245167.

It is an arithmetic number, because the mean of its divisors is an integer number (46490330).

Almost surely, 2^139470987 is an apocalyptic number.

139470987 is a deficient number, since it is larger than the sum of its proper divisors (46490333).

139470987 is an equidigital number, since it uses as much as digits as its factorization.

139470987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46490332.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 139470987 is about 11809.7835289221. The cubic root of 139470987 is about 518.5945616063.

The spelling of 139470987 in words is "one hundred thirty-nine million, four hundred seventy thousand, nine hundred eighty-seven".