139680479 has 2 divisors, whose sum is σ = 139680480. Its totient is φ = 139680478.

The previous prime is 139680433. The next prime is 139680487. The reversal of 139680479 is 974086931.

It is a strong prime.

It is an emirp because it is prime and its reverse (974086931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139680479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139680379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69840239 + 69840240.

It is an arithmetic number, because the mean of its divisors is an integer number (69840240).

Almost surely, 2^139680479 is an apocalyptic number.

139680479 is a deficient number, since it is larger than the sum of its proper divisors (1).

139680479 is an equidigital number, since it uses as much as digits as its factorization.

139680479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 139680479 is about 11818.6496267552. The cubic root of 139680479 is about 518.8540828749.

The spelling of 139680479 in words is "one hundred thirty-nine million, six hundred eighty thousand, four hundred seventy-nine".