30077821 has 2 divisors, whose sum is σ = 30077822. Its totient is φ = 30077820.

The previous prime is 30077809. The next prime is 30077863. The reversal of 30077821 is 12877003.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25502500 + 4575321 = 5050^2 + 2139^2 .

It is a cyclic number.

It is not a de Polignac number, because 30077821 - 2¹⁵ = 30045053 is a prime.

It is a super-2 number, since 2×30077821² = 1809350632216082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30077821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30077221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15038910 + 15038911.

It is an arithmetic number, because the mean of its divisors is an integer number (15038911).

Almost surely, 2^30077821 is an apocalyptic number.

It is an amenable number.

30077821 is a deficient number, since it is larger than the sum of its proper divisors (1).

30077821 is an equidigital number, since it uses as much as digits as its factorization.

30077821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 30077821 is about 5484.3250268379. The cubic root of 30077821 is about 310.9916941017.

The spelling of 30077821 in words is "thirty million, seventy-seven thousand, eight hundred twenty-one".