729997987 has 2 divisors, whose sum is σ = 729997988. Its totient is φ = 729997986.

The previous prime is 729997909. The next prime is 729998011. The reversal of 729997987 is 789799927.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 729997987 - 2²⁷ = 595780259 is a prime.

It is a super-2 number, since 2×729997987² = 1065794122048104338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (729991987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364998993 + 364998994.

It is an arithmetic number, because the mean of its divisors is an integer number (364998994).

Almost surely, 2^729997987 is an apocalyptic number.

729997987 is a deficient number, since it is larger than the sum of its proper divisors (1).

729997987 is an equidigital number, since it uses as much as digits as its factorization.

729997987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36006768, while the sum is 67.

The square root of 729997987 is about 27018.4749199506. The cubic root of 729997987 is about 900.4105069702.

The spelling of 729997987 in words is "seven hundred twenty-nine million, nine hundred ninety-seven thousand, nine hundred eighty-seven".