139445894 has 16 divisors (see below), whose sum is σ = 242619648. Its totient is φ = 58870152.

The previous prime is 139445857. The next prime is 139445899. The reversal of 139445894 is 498544931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139445899) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 73394 + ... + 75269.

It is an arithmetic number, because the mean of its divisors is an integer number (15163728).

Almost surely, 2^139445894 is an apocalyptic number.

139445894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

139445894 is a deficient number, since it is larger than the sum of its proper divisors (103173754).

139445894 is a wasteful number, since it uses less digits than its factorization.

139445894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148739.

The product of its digits is 622080, while the sum is 47.

The square root of 139445894 is about 11808.7210992554. The cubic root of 139445894 is about 518.5634586649.

The spelling of 139445894 in words is "one hundred thirty-nine million, four hundred forty-five thousand, eight hundred ninety-four".