139218308 has 6 divisors (see below), whose sum is σ = 243632046. Its totient is φ = 69609152.

The previous prime is 139218293. The next prime is 139218323. The reversal of 139218308 is 803812931.

It is an interprime number because it is at equal distance from previous prime (139218293) and next prime (139218323).

It can be written as a sum of positive squares in only one way, i.e., 133448704 + 5769604 = 11552^2 + 2402^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17402285 + ... + 17402292.

It is an arithmetic number, because the mean of its divisors is an integer number (40605341).

Almost surely, 2^139218308 is an apocalyptic number.

It is an amenable number.

139218308 is a deficient number, since it is larger than the sum of its proper divisors (104413738).

139218308 is a wasteful number, since it uses less digits than its factorization.

139218308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34804581 (or 34804579 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 139218308 is about 11799.0808116565. The cubic root of 139218308 is about 518.2811937597.

The spelling of 139218308 in words is "one hundred thirty-nine million, two hundred eighteen thousand, three hundred eight".