28219943 has 2 divisors, whose sum is σ = 28219944. Its totient is φ = 28219942.

The previous prime is 28219907. The next prime is 28219957. The reversal of 28219943 is 34991282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28219943 - 2⁸ = 28219687 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28219897 and 28219906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28219963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109971 + 14109972.

It is an arithmetic number, because the mean of its divisors is an integer number (14109972).

Almost surely, 2^28219943 is an apocalyptic number.

28219943 is a deficient number, since it is larger than the sum of its proper divisors (1).

28219943 is an equidigital number, since it uses as much as digits as its factorization.

28219943 is an evil number, because the sum of its binary digits is even.

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

The square root of 28219943 is about 5312.2446291563. The cubic root of 28219943 is about 304.4519154409.

The spelling of 28219943 in words is "twenty-eight million, two hundred nineteen thousand, nine hundred forty-three".