139778142 has 64 divisors (see below), whose sum is σ = 327366144. Its totient is φ = 38966400.

The previous prime is 139778129. The next prime is 139778161. The reversal of 139778142 is 241877931.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 139778094 and 139778103.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 351888 + ... + 352284.

It is an arithmetic number, because the mean of its divisors is an integer number (5115096).

Almost surely, 2^139778142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139778142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163683072).

139778142 is an abundant number, since it is smaller than the sum of its proper divisors (187588002).

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

139778142 is a wasteful number, since it uses less digits than its factorization.

139778142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593.

The product of its digits is 84672, while the sum is 42.

The square root of 139778142 is about 11822.7806373966. The cubic root of 139778142 is about 518.9749803242.

The spelling of 139778142 in words is "one hundred thirty-nine million, seven hundred seventy-eight thousand, one hundred forty-two".