139463939 has 4 divisors (see below), whose sum is σ = 140234640. Its totient is φ = 138693240.

The previous prime is 139463911. The next prime is 139463963. The reversal of 139463939 is 939364931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139463939 - 2¹⁶ = 139398403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139463893 and 139463902.

It is not an unprimeable number, because it can be changed into a prime (139463969) 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, 385079 + ... + 385440.

It is an arithmetic number, because the mean of its divisors is an integer number (35058660).

Almost surely, 2^139463939 is an apocalyptic number.

139463939 is a deficient number, since it is larger than the sum of its proper divisors (770701).

139463939 is an equidigital number, since it uses as much as digits as its factorization.

139463939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770700.

The product of its digits is 472392, while the sum is 47.

The square root of 139463939 is about 11809.4851284889. The cubic root of 139463939 is about 518.5858259399.

The spelling of 139463939 in words is "one hundred thirty-nine million, four hundred sixty-three thousand, nine hundred thirty-nine".