139342778 has 16 divisors (see below), whose sum is σ = 225063360. Its totient is φ = 64460736.

The previous prime is 139342771. The next prime is 139342811. The reversal of 139342778 is 877243931.

139342778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (139342771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32726 + ... + 36737.

It is an arithmetic number, because the mean of its divisors is an integer number (14066460).

Almost surely, 2^139342778 is an apocalyptic number.

139342778 is a deficient number, since it is larger than the sum of its proper divisors (85720582).

139342778 is a wasteful number, since it uses less digits than its factorization.

139342778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69541.

The product of its digits is 254016, while the sum is 44.

The square root of 139342778 is about 11804.3541966513. The cubic root of 139342778 is about 518.4356065070.

The spelling of 139342778 in words is "one hundred thirty-nine million, three hundred forty-two thousand, seven hundred seventy-eight".