28401839 has 2 divisors, whose sum is σ = 28401840. Its totient is φ = 28401838.

The previous prime is 28401823. The next prime is 28401847. The reversal of 28401839 is 93810482.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28401839 - 2⁴ = 28401823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28401799 and 28401808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28401739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200919 + 14200920.

It is an arithmetic number, because the mean of its divisors is an integer number (14200920).

Almost surely, 2^28401839 is an apocalyptic number.

28401839 is a deficient number, since it is larger than the sum of its proper divisors (1).

28401839 is an equidigital number, since it uses as much as digits as its factorization.

28401839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 28401839 is about 5329.3375760971. The cubic root of 28401839 is about 305.1046456292.

The spelling of 28401839 in words is "twenty-eight million, four hundred one thousand, eight hundred thirty-nine".