139978914 has 16 divisors (see below), whose sum is σ = 283901760. Its totient is φ = 46002320.

The previous prime is 139978913. The next prime is 139978939. The reversal of 139978914 is 419879931.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139978913) 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 7 ways as a sum of consecutive naturals, for example, 163869 + ... + 164720.

It is an arithmetic number, because the mean of its divisors is an integer number (17743860).

Almost surely, 2^139978914 is an apocalyptic number.

139978914 is an abundant number, since it is smaller than the sum of its proper divisors (143922846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139978914 is a wasteful number, since it uses less digits than its factorization.

139978914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328665.

The product of its digits is 489888, while the sum is 51.

The square root of 139978914 is about 11831.2684865149. The cubic root of 139978914 is about 519.2233400832.

The spelling of 139978914 in words is "one hundred thirty-nine million, nine hundred seventy-eight thousand, nine hundred fourteen".