23281387 has 2 divisors, whose sum is σ = 23281388. Its totient is φ = 23281386.

The previous prime is 23281367. The next prime is 23281439. The reversal of 23281387 is 78318232.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23281387 - 2¹⁹ = 22757099 is a prime.

It is not a weakly prime, because it can be changed into another prime (23281337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11640693 + 11640694.

It is an arithmetic number, because the mean of its divisors is an integer number (11640694).

Almost surely, 2^23281387 is an apocalyptic number.

23281387 is a deficient number, since it is larger than the sum of its proper divisors (1).

23281387 is an equidigital number, since it uses as much as digits as its factorization.

23281387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 23281387 is about 4825.0789630844. The cubic root of 23281387 is about 285.5417498904.

The spelling of 23281387 in words is "twenty-three million, two hundred eighty-one thousand, three hundred eighty-seven".