19672729 has 2 divisors, whose sum is σ = 19672730. Its totient is φ = 19672728.

The previous prime is 19672727. The next prime is 19672747. The reversal of 19672729 is 92727691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17264025 + 2408704 = 4155^2 + 1552^2 .

It is a cyclic number.

It is not a de Polignac number, because 19672729 - 2¹ = 19672727 is a prime.

Together with 19672727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19672727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9836364 + 9836365.

It is an arithmetic number, because the mean of its divisors is an integer number (9836365).

Almost surely, 2^19672729 is an apocalyptic number.

It is an amenable number.

19672729 is a deficient number, since it is larger than the sum of its proper divisors (1).

19672729 is an equidigital number, since it uses as much as digits as its factorization.

19672729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 19672729 is about 4435.3950218667. The cubic root of 19672729 is about 269.9530279513.

The spelling of 19672729 in words is "nineteen million, six hundred seventy-two thousand, seven hundred twenty-nine".