139781070 has 96 divisors (see below), whose sum is σ = 427006944. Its totient is φ = 31276800.

The previous prime is 139781069. The next prime is 139781093. The reversal of 139781070 is 70187931.

139781070 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7440 + ... + 18300.

It is an arithmetic number, because the mean of its divisors is an integer number (4447989).

Almost surely, 2^139781070 is an apocalyptic number.

139781070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139781070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213503472).

139781070 is an abundant number, since it is smaller than the sum of its proper divisors (287225874).

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

139781070 is a wasteful number, since it uses less digits than its factorization.

139781070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10898 (or 10895 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 139781070 is about 11822.9044654856. The cubic root of 139781070 is about 518.9786040385.

The spelling of 139781070 in words is "one hundred thirty-nine million, seven hundred eighty-one thousand, seventy".