139208709 has 8 divisors (see below), whose sum is σ = 185666112. Its totient is φ = 92778560.

The previous prime is 139208701. The next prime is 139208711. The reversal of 139208709 is 907802931.

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 139208709 - 2³ = 139208701 is a prime.

It is a super-2 number, since 2×139208709² = 38758129322893362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139208701) 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, 16957 + ... + 23789.

It is an arithmetic number, because the mean of its divisors is an integer number (23208264).

Almost surely, 2^139208709 is an apocalyptic number.

It is an amenable number.

139208709 is a deficient number, since it is larger than the sum of its proper divisors (46457403).

139208709 is an equidigital number, since it uses as much as digits as its factorization.

139208709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13627.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 139208709 is about 11798.6740356703. The cubic root of 139208709 is about 518.2692817834.

The spelling of 139208709 in words is "one hundred thirty-nine million, two hundred eight thousand, seven hundred nine".