139866393 has 8 divisors (see below), whose sum is σ = 186716800. Its totient is φ = 93130128.

The previous prime is 139866383. The next prime is 139866431. The reversal of 139866393 is 393668931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 139866393 - 2⁶ = 139866329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139866323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25633 + ... + 30606.

It is an arithmetic number, because the mean of its divisors is an integer number (23339600).

Almost surely, 2^139866393 is an apocalyptic number.

It is an amenable number.

139866393 is a deficient number, since it is larger than the sum of its proper divisors (46850407).

139866393 is an equidigital number, since it uses as much as digits as its factorization.

139866393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57071.

The product of its digits is 629856, while the sum is 48.

The square root of 139866393 is about 11826.5122923033. The cubic root of 139866393 is about 519.0841781928.

The spelling of 139866393 in words is "one hundred thirty-nine million, eight hundred sixty-six thousand, three hundred ninety-three".