23287729 has 2 divisors, whose sum is σ = 23287730. Its totient is φ = 23287728.

The previous prime is 23287717. The next prime is 23287751. The reversal of 23287729 is 92778232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21902400 + 1385329 = 4680^2 + 1177^2 .

It is a cyclic number.

It is not a de Polignac number, because 23287729 - 2¹³ = 23279537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23287691 and 23287700.

It is not a weakly prime, because it can be changed into another prime (23287709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11643864 + 11643865.

It is an arithmetic number, because the mean of its divisors is an integer number (11643865).

Almost surely, 2^23287729 is an apocalyptic number.

It is an amenable number.

23287729 is a deficient number, since it is larger than the sum of its proper divisors (1).

23287729 is an equidigital number, since it uses as much as digits as its factorization.

23287729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 40.

The square root of 23287729 is about 4825.7361096521. The cubic root of 23287729 is about 285.5676753413.

The spelling of 23287729 in words is "twenty-three million, two hundred eighty-seven thousand, seven hundred twenty-nine".