28293439 has 2 divisors, whose sum is σ = 28293440. Its totient is φ = 28293438.

The previous prime is 28293407. The next prime is 28293443. The reversal of 28293439 is 93439282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28293439 - 2⁵ = 28293407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28293449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14146719 + 14146720.

It is an arithmetic number, because the mean of its divisors is an integer number (14146720).

Almost surely, 2^28293439 is an apocalyptic number.

28293439 is a deficient number, since it is larger than the sum of its proper divisors (1).

28293439 is an equidigital number, since it uses as much as digits as its factorization.

28293439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 28293439 is about 5319.1577340778. The cubic root of 28293439 is about 304.7159911065.

The spelling of 28293439 in words is "twenty-eight million, two hundred ninety-three thousand, four hundred thirty-nine".