139507709 has 8 divisors (see below), whose sum is σ = 160200480. Its totient is φ = 120150000.

The previous prime is 139507691. The next prime is 139507727. The reversal of 139507709 is 907705931.

It is an interprime number because it is at equal distance from previous prime (139507691) and next prime (139507727).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139507709 is a prime.

It is a super-3 number, since 3×139507709³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139507769) 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, 333542 + ... + 333959.

It is an arithmetic number, because the mean of its divisors is an integer number (20025060).

Almost surely, 2^139507709 is an apocalyptic number.

139507709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

139507709 is a deficient number, since it is larger than the sum of its proper divisors (20692771).

139507709 is a wasteful number, since it uses less digits than its factorization.

139507709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667531.

The product of its (nonzero) digits is 59535, while the sum is 41.

The square root of 139507709 is about 11811.3381545022. The cubic root of 139507709 is about 518.6400720473.

The spelling of 139507709 in words is "one hundred thirty-nine million, five hundred seven thousand, seven hundred nine".