139980978 has 24 divisors (see below), whose sum is σ = 304824000. Its totient is φ = 46424664.

The previous prime is 139980959. The next prime is 139980989. The reversal of 139980978 is 879089931.

139980978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15958 + ... + 23121.

It is an arithmetic number, because the mean of its divisors is an integer number (12701000).

Almost surely, 2^139980978 is an apocalyptic number.

139980978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

139980978 is an abundant number, since it is smaller than the sum of its proper divisors (164843022).

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

139980978 is a wasteful number, since it uses less digits than its factorization.

139980978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39286 (or 39283 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 139980978 is about 11831.3557126815. The cubic root of 139980978 is about 519.2258920669.

The spelling of 139980978 in words is "one hundred thirty-nine million, nine hundred eighty thousand, nine hundred seventy-eight".