139421878 has 4 divisors (see below), whose sum is σ = 209132820. Its totient is φ = 69710938.

The previous prime is 139421873. The next prime is 139421903. The reversal of 139421878 is 878124931.

139421878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139421873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34855468 + ... + 34855471.

It is an arithmetic number, because the mean of its divisors is an integer number (52283205).

Almost surely, 2^139421878 is an apocalyptic number.

139421878 is a deficient number, since it is larger than the sum of its proper divisors (69710942).

139421878 is an equidigital number, since it uses as much as digits as its factorization.

139421878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69710941.

The product of its digits is 96768, while the sum is 43.

The square root of 139421878 is about 11807.7041798988. The cubic root of 139421878 is about 518.5336871774.

The spelling of 139421878 in words is "one hundred thirty-nine million, four hundred twenty-one thousand, eight hundred seventy-eight".