139171394 has 8 divisors (see below), whose sum is σ = 210087228. Its totient is φ = 69142320.

The previous prime is 139171391. The next prime is 139171397. The reversal of 139171394 is 493171931.

It is an interprime number because it is at equal distance from previous prime (139171391) and next prime (139171397).

It can be written as a sum of positive squares in 2 ways, for example, as 111028369 + 28143025 = 10537^2 + 5305^2 .

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

It is not an unprimeable number, because it can be changed into a prime (139171391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221297 + ... + 221924.

Almost surely, 2^139171394 is an apocalyptic number.

139171394 is a deficient number, since it is larger than the sum of its proper divisors (70915834).

139171394 is a wasteful number, since it uses less digits than its factorization.

139171394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443380.

The product of its digits is 20412, while the sum is 38.

The square root of 139171394 is about 11797.0926079268. The cubic root of 139171394 is about 518.2229701539. Note that the first 3 decimals are identical.

The spelling of 139171394 in words is "one hundred thirty-nine million, one hundred seventy-one thousand, three hundred ninety-four".