30420865 has 4 divisors (see below), whose sum is σ = 36505044. Its totient is φ = 24336688.

The previous prime is 30420857. The next prime is 30420877. The reversal of 30420865 is 56802403.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19158129 + 11262736 = 4377^2 + 3356^2 .

It is a cyclic number.

It is not a de Polignac number, because 30420865 - 2³ = 30420857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3042082 + ... + 3042091.

It is an arithmetic number, because the mean of its divisors is an integer number (9126261).

Almost surely, 2^30420865 is an apocalyptic number.

It is an amenable number.

30420865 is a deficient number, since it is larger than the sum of its proper divisors (6084179).

30420865 is an equidigital number, since it uses as much as digits as its factorization.

30420865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6084178.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 30420865 is about 5515.5113090266. The cubic root of 30420865 is about 312.1695365303.

The spelling of 30420865 in words is "thirty million, four hundred twenty thousand, eight hundred sixty-five".