139218306 has 8 divisors (see below), whose sum is σ = 278436624. Its totient is φ = 46406100.

The previous prime is 139218293. The next prime is 139218323. The reversal of 139218306 is 603812931.

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

139218306 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11601520 + ... + 11601531.

It is an arithmetic number, because the mean of its divisors is an integer number (34804578).

Almost surely, 2^139218306 is an apocalyptic number.

139218306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139218306 is a wasteful number, since it uses less digits than its factorization.

139218306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23203056.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 139218306 is about 11799.0807269041. The cubic root of 139218306 is about 518.2811912778.

The spelling of 139218306 in words is "one hundred thirty-nine million, two hundred eighteen thousand, three hundred six".