139263978 has 48 divisors (see below), whose sum is σ = 326251584. Its totient is φ = 39513600.

The previous prime is 139263953. The next prime is 139264033. The reversal of 139263978 is 879362931.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42826 + ... + 45962.

It is an arithmetic number, because the mean of its divisors is an integer number (6796908).

Almost surely, 2^139263978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139263978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163125792).

139263978 is an abundant number, since it is smaller than the sum of its proper divisors (186987606).

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

139263978 is a wasteful number, since it uses less digits than its factorization.

139263978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307 (or 3300 counting only the distinct ones).

The product of its digits is 489888, while the sum is 48.

The square root of 139263978 is about 11801.0159732118. The cubic root of 139263978 is about 518.3378609099.

The spelling of 139263978 in words is "one hundred thirty-nine million, two hundred sixty-three thousand, nine hundred seventy-eight".