139474729 has 2 divisors, whose sum is σ = 139474730. Its totient is φ = 139474728.

The previous prime is 139474723. The next prime is 139474759. The reversal of 139474729 is 927474931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135769104 + 3705625 = 11652^2 + 1925^2 .

It is a cyclic number.

It is not a de Polignac number, because 139474729 - 2³ = 139474721 is a prime.

It is not a weakly prime, because it can be changed into another prime (139474721) 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 as a sum of consecutive naturals, namely, 69737364 + 69737365.

It is an arithmetic number, because the mean of its divisors is an integer number (69737365).

Almost surely, 2^139474729 is an apocalyptic number.

It is an amenable number.

139474729 is a deficient number, since it is larger than the sum of its proper divisors (1).

139474729 is an equidigital number, since it uses as much as digits as its factorization.

139474729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 46.

The square root of 139474729 is about 11809.9419558269. The cubic root of 139474729 is about 518.5991995207.

The spelling of 139474729 in words is "one hundred thirty-nine million, four hundred seventy-four thousand, seven hundred twenty-nine".