139897844 has 6 divisors (see below), whose sum is σ = 244821234. Its totient is φ = 69948920.

The previous prime is 139897843. The next prime is 139897883. The reversal of 139897844 is 448798931.

It can be written as a sum of positive squares in only one way, i.e., 138956944 + 940900 = 11788^2 + 970^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139897841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17487227 + ... + 17487234.

It is an arithmetic number, because the mean of its divisors is an integer number (40803539).

Almost surely, 2^139897844 is an apocalyptic number.

It is an amenable number.

139897844 is a deficient number, since it is larger than the sum of its proper divisors (104923390).

139897844 is a wasteful number, since it uses less digits than its factorization.

139897844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34974465 (or 34974463 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 53.

The square root of 139897844 is about 11827.8418995183. The cubic root of 139897844 is about 519.1230831615.

The spelling of 139897844 in words is "one hundred thirty-nine million, eight hundred ninety-seven thousand, eight hundred forty-four".