139671418 has 4 divisors (see below), whose sum is σ = 209507130. Its totient is φ = 69835708.

The previous prime is 139671409. The next prime is 139671421. The reversal of 139671418 is 814176931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 139641489 + 29929 = 11817^2 + 173^2 .

It is a super-3 number, since 3×139671418³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34917853 + ... + 34917856.

Almost surely, 2^139671418 is an apocalyptic number.

139671418 is a deficient number, since it is larger than the sum of its proper divisors (69835712).

139671418 is an equidigital number, since it uses as much as digits as its factorization.

139671418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69835711.

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

The square root of 139671418 is about 11818.2662857121. The cubic root of 139671418 is about 518.8428633674.

The spelling of 139671418 in words is "one hundred thirty-nine million, six hundred seventy-one thousand, four hundred eighteen".