139978306 has 36 divisors (see below), whose sum is σ = 241690662. Its totient is φ = 60762624.

The previous prime is 139978277. The next prime is 139978313. The reversal of 139978306 is 603879931.

It can be written as a sum of positive squares in 9 ways, for example, as 29539225 + 110439081 = 5435^2 + 10509^2 .

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 96966 + ... + 98398.

Almost surely, 2^139978306 is an apocalyptic number.

139978306 is a deficient number, since it is larger than the sum of its proper divisors (101712356).

139978306 is a wasteful number, since it uses less digits than its factorization.

139978306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 139978306 is about 11831.2427918626. The cubic root of 139978306 is about 519.2225883313. Note that the first 3 decimals are identical.

The spelling of 139978306 in words is "one hundred thirty-nine million, nine hundred seventy-eight thousand, three hundred six".