139798509 has 8 divisors (see below), whose sum is σ = 187178880. Its totient is φ = 92808576.

The previous prime is 139798507. The next prime is 139798541. The reversal of 139798509 is 905897931.

It is a happy number.

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

It is not a de Polignac number, because 139798509 - 2¹ = 139798507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139798507) 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, 96772 + ... + 98205.

It is an arithmetic number, because the mean of its divisors is an integer number (23397360).

Almost surely, 2^139798509 is an apocalyptic number.

It is an amenable number.

139798509 is a deficient number, since it is larger than the sum of its proper divisors (47380371).

139798509 is a wasteful number, since it uses less digits than its factorization.

139798509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195219.

The product of its (nonzero) digits is 612360, while the sum is 51.

The square root of 139798509 is about 11823.6419516154. The cubic root of 139798509 is about 519.0001856244. Note that the first 3 decimals are identical.

The spelling of 139798509 in words is "one hundred thirty-nine million, seven hundred ninety-eight thousand, five hundred nine".