28423399 has 2 divisors, whose sum is σ = 28423400. Its totient is φ = 28423398.

The previous prime is 28423397. The next prime is 28423441. The reversal of 28423399 is 99332482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28423399 - 2¹ = 28423397 is a prime.

It is a super-2 number, since 2×28423399² = 1615779221426402, which contains 22 as substring.

Together with 28423397, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28423397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14211699 + 14211700.

It is an arithmetic number, because the mean of its divisors is an integer number (14211700).

Almost surely, 2^28423399 is an apocalyptic number.

28423399 is a deficient number, since it is larger than the sum of its proper divisors (1).

28423399 is an equidigital number, since it uses as much as digits as its factorization.

28423399 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28423399 is about 5331.3599578344. The cubic root of 28423399 is about 305.1818283353.

It can be divided in two parts, 2842 and 3399, that added together give a square (6241 = 79²).

The spelling of 28423399 in words is "twenty-eight million, four hundred twenty-three thousand, three hundred ninety-nine".