139186417 has 4 divisors (see below), whose sum is σ = 139764196. Its totient is φ = 138608640.

The previous prime is 139186393. The next prime is 139186423. The reversal of 139186417 is 714681931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 714681931 = 2437 ⋅293263.

It can be written as a sum of positive squares in 2 ways, for example, as 98724096 + 40462321 = 9936^2 + 6361^2 .

It is a cyclic number.

It is not a de Polignac number, because 139186417 - 2¹⁹ = 138662129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139186417.

It is not an unprimeable number, because it can be changed into a prime (139186217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288528 + ... + 289009.

It is an arithmetic number, because the mean of its divisors is an integer number (34941049).

Almost surely, 2^139186417 is an apocalyptic number.

It is an amenable number.

139186417 is a deficient number, since it is larger than the sum of its proper divisors (577779).

139186417 is an equidigital number, since it uses as much as digits as its factorization.

139186417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577778.

The product of its digits is 36288, while the sum is 40.

The square root of 139186417 is about 11797.7293154234. The cubic root of 139186417 is about 518.2416161878.

The spelling of 139186417 in words is "one hundred thirty-nine million, one hundred eighty-six thousand, four hundred seventeen".