139281224 has 8 divisors (see below), whose sum is σ = 261152310. Its totient is φ = 69640608.

The previous prime is 139281217. The next prime is 139281253. The reversal of 139281224 is 422182931.

It can be written as a sum of positive squares in only one way, i.e., 132940900 + 6340324 = 11530^2 + 2518^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8705069 + ... + 8705084.

Almost surely, 2^139281224 is an apocalyptic number.

It is an amenable number.

139281224 is a deficient number, since it is larger than the sum of its proper divisors (121871086).

139281224 is a wasteful number, since it uses less digits than its factorization.

139281224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17410159 (or 17410155 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 139281224 is about 11801.7466503904. The cubic root of 139281224 is about 518.3592564540.

The spelling of 139281224 in words is "one hundred thirty-nine million, two hundred eighty-one thousand, two hundred twenty-four".