139802218 has 4 divisors (see below), whose sum is σ = 209703330. Its totient is φ = 69901108.

The previous prime is 139802207. The next prime is 139802239. The reversal of 139802218 is 812208931.

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., 86992929 + 52809289 = 9327^2 + 7267^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 34950553 + ... + 34950556.

Almost surely, 2^139802218 is an apocalyptic number.

139802218 is a deficient number, since it is larger than the sum of its proper divisors (69901112).

139802218 is an equidigital number, since it uses as much as digits as its factorization.

139802218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69901111.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 139802218 is about 11823.7987973409. The cubic root of 139802218 is about 519.0047754556.

The spelling of 139802218 in words is "one hundred thirty-nine million, eight hundred two thousand, two hundred eighteen".