139040389 has 4 divisors (see below), whose sum is σ = 142431660. Its totient is φ = 135649120.

The previous prime is 139040383. The next prime is 139040417. The reversal of 139040389 is 983040931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 983040931 = 43 ⋅22861417.

It can be written as a sum of positive squares in 2 ways, for example, as 36180225 + 102860164 = 6015^2 + 10142^2 .

It is a cyclic number.

It is not a de Polignac number, because 139040389 - 2³ = 139040381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139040381) 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 3 ways as a sum of consecutive naturals, for example, 1695574 + ... + 1695655.

It is an arithmetic number, because the mean of its divisors is an integer number (35607915).

Almost surely, 2^139040389 is an apocalyptic number.

It is an amenable number.

139040389 is a deficient number, since it is larger than the sum of its proper divisors (3391271).

139040389 is an equidigital number, since it uses as much as digits as its factorization.

139040389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391270.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 139040389 is about 11791.5388732769. The cubic root of 139040389 is about 518.0603143297.

The spelling of 139040389 in words is "one hundred thirty-nine million, forty thousand, three hundred eighty-nine".