139000421 has 16 divisors (see below), whose sum is σ = 161994240. Its totient is φ = 116812800.

The previous prime is 139000391. The next prime is 139000423. The reversal of 139000421 is 124000931.

It is a cyclic number.

It is not a de Polignac number, because 139000421 - 2¹⁰ = 138999397 is a prime.

It is a super-2 number, since 2×139000421² = 38642234076354482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139000393 and 139000402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139000423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86021 + ... + 87621.

It is an arithmetic number, because the mean of its divisors is an integer number (10124640).

Almost surely, 2^139000421 is an apocalyptic number.

It is an amenable number.

139000421 is a deficient number, since it is larger than the sum of its proper divisors (22993819).

139000421 is a wasteful number, since it uses less digits than its factorization.

139000421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 139000421 is about 11789.8439769150. The cubic root of 139000421 is about 518.0106697166.

The spelling of 139000421 in words is "one hundred thirty-nine million, four hundred twenty-one", and thus it is an aban number.