139742837 has 4 divisors (see below), whose sum is σ = 150492300. Its totient is φ = 128993376.

The previous prime is 139742833. The next prime is 139742843. The reversal of 139742837 is 738247931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 738247931 = 2281 ⋅323651.

It can be written as a sum of positive squares in 2 ways, for example, as 15888196 + 123854641 = 3986^2 + 11129^2 .

It is a cyclic number.

It is not a de Polignac number, because 139742837 - 2² = 139742833 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 (139742833) 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, 5374712 + ... + 5374737.

It is an arithmetic number, because the mean of its divisors is an integer number (37623075).

Almost surely, 2^139742837 is an apocalyptic number.

It is an amenable number.

139742837 is a deficient number, since it is larger than the sum of its proper divisors (10749463).

139742837 is a wasteful number, since it uses less digits than its factorization.

139742837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10749462.

The product of its digits is 254016, while the sum is 44.

The square root of 139742837 is about 11821.2874510351. The cubic root of 139742837 is about 518.9312826134.

The spelling of 139742837 in words is "one hundred thirty-nine million, seven hundred forty-two thousand, eight hundred thirty-seven".