139978073 has 4 divisors (see below), whose sum is σ = 147345360. Its totient is φ = 132610788.

The previous prime is 139978063. The next prime is 139978087. The reversal of 139978073 is 370879931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139978073 - 2⁶ = 139978009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139978063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3683615 + ... + 3683652.

It is an arithmetic number, because the mean of its divisors is an integer number (36836340).

Almost surely, 2^139978073 is an apocalyptic number.

It is an amenable number.

139978073 is a deficient number, since it is larger than the sum of its proper divisors (7367287).

139978073 is an equidigital number, since it uses as much as digits as its factorization.

139978073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367286.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 139978073 is about 11831.2329450485. The cubic root of 139978073 is about 519.2223002416. Note that the first 3 decimals are identical.

The spelling of 139978073 in words is "one hundred thirty-nine million, nine hundred seventy-eight thousand, seventy-three".