139278434 has 8 divisors (see below), whose sum is σ = 214564188. Its totient is φ = 67757040.

The previous prime is 139278431. The next prime is 139278439. The reversal of 139278434 is 434872931.

It can be written as a sum of positive squares in 2 ways, for example, as 96963409 + 42315025 = 9847^2 + 6505^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 139278391 and 139278400.

It is not an unprimeable number, because it can be changed into a prime (139278431) 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, 940997 + ... + 941144.

Almost surely, 2^139278434 is an apocalyptic number.

139278434 is a deficient number, since it is larger than the sum of its proper divisors (75285754).

139278434 is a wasteful number, since it uses less digits than its factorization.

139278434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882180.

The product of its digits is 145152, while the sum is 41.

The square root of 139278434 is about 11801.6284469560. The cubic root of 139278434 is about 518.3557952745.

The spelling of 139278434 in words is "one hundred thirty-nine million, two hundred seventy-eight thousand, four hundred thirty-four".