139139780 has 96 divisors (see below), whose sum is σ = 331312128. Its totient is φ = 48729600.

The previous prime is 139139779. The next prime is 139139797. The reversal of 139139780 is 87931931.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 491519 + ... + 491801.

It is an arithmetic number, because the mean of its divisors is an integer number (3451168).

Almost surely, 2^139139780 is an apocalyptic number.

139139780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139139780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165656064).

139139780 is an abundant number, since it is smaller than the sum of its proper divisors (192172348).

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

139139780 is a wasteful number, since it uses less digits than its factorization.

139139780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 139139780 is about 11795.7526254156. The cubic root of 139139780 is about 518.1837275548.

The spelling of 139139780 in words is "one hundred thirty-nine million, one hundred thirty-nine thousand, seven hundred eighty".