28981943 has 2 divisors, whose sum is σ = 28981944. Its totient is φ = 28981942.

The previous prime is 28981907. The next prime is 28981969. The reversal of 28981943 is 34918982.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28981943 - 2⁶ = 28981879 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28981894 and 28981903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28981343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14490971 + 14490972.

It is an arithmetic number, because the mean of its divisors is an integer number (14490972).

Almost surely, 2^28981943 is an apocalyptic number.

28981943 is a deficient number, since it is larger than the sum of its proper divisors (1).

28981943 is an equidigital number, since it uses as much as digits as its factorization.

28981943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The square root of 28981943 is about 5383.4879957143. The cubic root of 28981943 is about 307.1679028637.

The spelling of 28981943 in words is "twenty-eight million, nine hundred eighty-one thousand, nine hundred forty-three".