28214939 has 2 divisors, whose sum is σ = 28214940. Its totient is φ = 28214938.

The previous prime is 28214933. The next prime is 28214947. The reversal of 28214939 is 93941282.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28214939 is a prime.

It is not a weakly prime, because it can be changed into another prime (28214933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14107469 + 14107470.

It is an arithmetic number, because the mean of its divisors is an integer number (14107470).

Almost surely, 2^28214939 is an apocalyptic number.

28214939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28214939 is an equidigital number, since it uses as much as digits as its factorization.

28214939 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 28214939 is about 5311.7736209293. The cubic root of 28214939 is about 304.4339190965.

The spelling of 28214939 in words is "twenty-eight million, two hundred fourteen thousand, nine hundred thirty-nine".