139398181 has 16 divisors (see below), whose sum is σ = 159364800. Its totient is φ = 120791808.

The previous prime is 139398173. The next prime is 139398191. The reversal of 139398181 is 181893931.

It is a cyclic number.

It is not a de Polignac number, because 139398181 - 2³ = 139398173 is a prime.

It is a super-2 number, since 2×139398181² = 38863705732217522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139398191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136290 + ... + 137308.

It is an arithmetic number, because the mean of its divisors is an integer number (9960300).

Almost surely, 2^139398181 is an apocalyptic number.

It is an amenable number.

139398181 is a deficient number, since it is larger than the sum of its proper divisors (19966619).

139398181 is a wasteful number, since it uses less digits than its factorization.

139398181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668.

The product of its digits is 46656, while the sum is 43.

The square root of 139398181 is about 11806.7006822397. The cubic root of 139398181 is about 518.5043077879.

The spelling of 139398181 in words is "one hundred thirty-nine million, three hundred ninety-eight thousand, one hundred eighty-one".