139393858 has 4 divisors (see below), whose sum is σ = 209090790. Its totient is φ = 69696928.

The previous prime is 139393853. The next prime is 139393867. The reversal of 139393858 is 858393931.

139393858 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 can be written as a sum of positive squares in only one way, i.e., 88228449 + 51165409 = 9393^2 + 7153^2 .

It is not an unprimeable number, because it can be changed into a prime (139393853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34848463 + ... + 34848466.

Almost surely, 2^139393858 is an apocalyptic number.

139393858 is a deficient number, since it is larger than the sum of its proper divisors (69696932).

139393858 is an equidigital number, since it uses as much as digits as its factorization.

139393858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69696931.

The product of its digits is 699840, while the sum is 49.

The square root of 139393858 is about 11806.5176068136. The cubic root of 139393858 is about 518.4989478009.

The spelling of 139393858 in words is "one hundred thirty-nine million, three hundred ninety-three thousand, eight hundred fifty-eight".