706139987 has 4 divisors (see below), whose sum is σ = 807017136. Its totient is φ = 605262840.

The previous prime is 706139983. The next prime is 706139989. The reversal of 706139987 is 789931607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789931607 = 229 ⋅3449483.

It is not a de Polignac number, because 706139987 - 2² = 706139983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (706139983) 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, 50438564 + ... + 50438577.

It is an arithmetic number, because the mean of its divisors is an integer number (201754284).

Almost surely, 2^706139987 is an apocalyptic number.

706139987 is a deficient number, since it is larger than the sum of its proper divisors (100877149).

706139987 is a wasteful number, since it uses less digits than its factorization.

706139987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100877148.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 706139987 is about 26573.2946207278. The cubic root of 706139987 is about 890.4925048364.

The spelling of 706139987 in words is "seven hundred six million, one hundred thirty-nine thousand, nine hundred eighty-seven".