139438489 has 4 divisors (see below), whose sum is σ = 145501056. Its totient is φ = 133375924.

The previous prime is 139438483. The next prime is 139438501. The reversal of 139438489 is 984834931.

139438489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139438489 - 2¹⁹ = 138914201 is a prime.

It is a super-3 number, since 3×139438489³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139438483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3031249 + ... + 3031294.

It is an arithmetic number, because the mean of its divisors is an integer number (36375264).

Almost surely, 2^139438489 is an apocalyptic number.

It is an amenable number.

139438489 is a deficient number, since it is larger than the sum of its proper divisors (6062567).

139438489 is an equidigital number, since it uses as much as digits as its factorization.

139438489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6062566.

The product of its digits is 746496, while the sum is 49.

The square root of 139438489 is about 11808.4075556359. The cubic root of 139438489 is about 518.5542794048.

The spelling of 139438489 in words is "one hundred thirty-nine million, four hundred thirty-eight thousand, four hundred eighty-nine".