28402039 has 2 divisors, whose sum is σ = 28402040. Its totient is φ = 28402038.

The previous prime is 28402007. The next prime is 28402061. The reversal of 28402039 is 93020482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28402039 - 2⁵ = 28402007 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28401998 and 28402016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28402139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14201019 + 14201020.

It is an arithmetic number, because the mean of its divisors is an integer number (14201020).

Almost surely, 2^28402039 is an apocalyptic number.

28402039 is a deficient number, since it is larger than the sum of its proper divisors (1).

28402039 is an equidigital number, since it uses as much as digits as its factorization.

28402039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 28402039 is about 5329.3563401221. The cubic root of 28402039 is about 305.1053617892.

The spelling of 28402039 in words is "twenty-eight million, four hundred two thousand, thirty-nine".