139994989 has 4 divisors (see below), whose sum is σ = 141381180. Its totient is φ = 138608800.

The previous prime is 139994963. The next prime is 139995007. The reversal of 139994989 is 989499931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121220100 + 18774889 = 11010^2 + 4333^2 .

It is a cyclic number.

It is not a de Polignac number, because 139994989 - 2¹⁷ = 139863917 is a prime.

It is a super-2 number, since 2×139994989² = 39197193890220242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139994929) 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, 692944 + ... + 693145.

It is an arithmetic number, because the mean of its divisors is an integer number (35345295).

Almost surely, 2^139994989 is an apocalyptic number.

It is an amenable number.

139994989 is a deficient number, since it is larger than the sum of its proper divisors (1386191).

139994989 is a wasteful number, since it uses less digits than its factorization.

139994989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386190.

The product of its digits is 5668704, while the sum is 61.

The square root of 139994989 is about 11831.9478109059. The cubic root of 139994989 is about 519.2432149712.

The spelling of 139994989 in words is "one hundred thirty-nine million, nine hundred ninety-four thousand, nine hundred eighty-nine".