139478783 has 4 divisors (see below), whose sum is σ = 140021760. Its totient is φ = 138935808.

The previous prime is 139478771. The next prime is 139478803. The reversal of 139478783 is 387874931.

139478783 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 is a cyclic number.

It is not a de Polignac number, because 139478783 - 2⁸ = 139478527 is a prime.

It is a super-2 number, since 2×139478783² = 38908661814322178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139478723) 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, 271103 + ... + 271616.

It is an arithmetic number, because the mean of its divisors is an integer number (35005440).

Almost surely, 2^139478783 is an apocalyptic number.

139478783 is a deficient number, since it is larger than the sum of its proper divisors (542977).

139478783 is an equidigital number, since it uses as much as digits as its factorization.

139478783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542976.

The product of its digits is 1016064, while the sum is 50.

The square root of 139478783 is about 11810.1135896316. The cubic root of 139478783 is about 518.6042240409.

The spelling of 139478783 in words is "one hundred thirty-nine million, four hundred seventy-eight thousand, seven hundred eighty-three".