729981407 has 2 divisors, whose sum is σ = 729981408. Its totient is φ = 729981406.

The previous prime is 729981389. The next prime is 729981419. The reversal of 729981407 is 704189927.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729981407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729981457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364990703 + 364990704.

It is an arithmetic number, because the mean of its divisors is an integer number (364990704).

Almost surely, 2^729981407 is an apocalyptic number.

729981407 is a deficient number, since it is larger than the sum of its proper divisors (1).

729981407 is an equidigital number, since it uses as much as digits as its factorization.

729981407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 729981407 is about 27018.1680911197. The cubic root of 729981407 is about 900.4036900934.

The spelling of 729981407 in words is "seven hundred twenty-nine million, nine hundred eighty-one thousand, four hundred seven".