30428869 has 2 divisors, whose sum is σ = 30428870. Its totient is φ = 30428868.

The previous prime is 30428857. The next prime is 30428873. The reversal of 30428869 is 96882403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26388769 + 4040100 = 5137^2 + 2010^2 .

It is an emirp because it is prime and its reverse (96882403) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30428869 - 2¹⁵ = 30396101 is a prime.

It is a super-2 number, since 2×30428869² = 1851832137238322, which contains 22 as substring.

It is equal to p_1882849 and since 30428869 and 1882849 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30428269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15214434 + 15214435.

It is an arithmetic number, because the mean of its divisors is an integer number (15214435).

Almost surely, 2^30428869 is an apocalyptic number.

It is an amenable number.

30428869 is a deficient number, since it is larger than the sum of its proper divisors (1).

30428869 is an equidigital number, since it uses as much as digits as its factorization.

30428869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 30428869 is about 5516.2368513326. The cubic root of 30428869 is about 312.1969123229.

It can be divided in two parts, 3042 and 8869, that added together give a palindrome (11911).

The spelling of 30428869 in words is "thirty million, four hundred twenty-eight thousand, eight hundred sixty-nine".