139198138 has 16 divisors (see below), whose sum is σ = 216238176. Its totient is φ = 67158000.

The previous prime is 139198121. The next prime is 139198151. The reversal of 139198138 is 831891931.

It is a super-2 number, since 2×139198138² = 38752243245334088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 139198094 and 139198103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2613 + ... + 16888.

It is an arithmetic number, because the mean of its divisors is an integer number (13514886).

Almost surely, 2^139198138 is an apocalyptic number.

139198138 is a deficient number, since it is larger than the sum of its proper divisors (77040038).

139198138 is a wasteful number, since it uses less digits than its factorization.

139198138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19629.

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

The square root of 139198138 is about 11798.2260530980. The cubic root of 139198138 is about 518.2561629604.

The spelling of 139198138 in words is "one hundred thirty-nine million, one hundred ninety-eight thousand, one hundred thirty-eight".