139190489 has 4 divisors (see below), whose sum is σ = 139241124. Its totient is φ = 139139856.

The previous prime is 139190479. The next prime is 139190497. The reversal of 139190489 is 984091931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984091931 = 31 ⋅31744901.

It can be written as a sum of positive squares in 2 ways, for example, as 104203264 + 34987225 = 10208^2 + 5915^2 .

It is a cyclic number.

It is not a de Polignac number, because 139190489 - 2¹² = 139186393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139190479) 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 3 ways as a sum of consecutive naturals, for example, 20942 + ... + 26775.

It is an arithmetic number, because the mean of its divisors is an integer number (34810281).

Almost surely, 2^139190489 is an apocalyptic number.

It is an amenable number.

139190489 is a deficient number, since it is larger than the sum of its proper divisors (50635).

139190489 is an equidigital number, since it uses as much as digits as its factorization.

139190489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50634.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 139190489 is about 11797.9018897429. The cubic root of 139190489 is about 518.2466699838.

The spelling of 139190489 in words is "one hundred thirty-nine million, one hundred ninety thousand, four hundred eighty-nine".