139120509 has 8 divisors (see below), whose sum is σ = 202357152. Its totient is φ = 84315440.

The previous prime is 139120507. The next prime is 139120547. The reversal of 139120509 is 905021931.

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

It is not a de Polignac number, because 139120509 - 2¹ = 139120507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139120507) 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, 2107854 + ... + 2107919.

It is an arithmetic number, because the mean of its divisors is an integer number (25294644).

Almost surely, 2^139120509 is an apocalyptic number.

It is an amenable number.

139120509 is a deficient number, since it is larger than the sum of its proper divisors (63236643).

139120509 is a wasteful number, since it uses less digits than its factorization.

139120509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4215787.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 139120509 is about 11794.9357353061. The cubic root of 139120509 is about 518.1598034605.

The spelling of 139120509 in words is "one hundred thirty-nine million, one hundred twenty thousand, five hundred nine".