28142399 has 2 divisors, whose sum is σ = 28142400. Its totient is φ = 28142398.

The previous prime is 28142393. The next prime is 28142419. The reversal of 28142399 is 99324182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28142399 - 2¹² = 28138303 is a prime.

It is equal to p_1749737 and since 28142399 and 1749737 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28142393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14071199 + 14071200.

It is an arithmetic number, because the mean of its divisors is an integer number (14071200).

Almost surely, 2^28142399 is an apocalyptic number.

28142399 is a deficient number, since it is larger than the sum of its proper divisors (1).

28142399 is an equidigital number, since it uses as much as digits as its factorization.

28142399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 28142399 is about 5304.9409987294. The cubic root of 28142399 is about 304.1727975078.

The spelling of 28142399 in words is "twenty-eight million, one hundred forty-two thousand, three hundred ninety-nine".