30390819 has 16 divisors (see below), whose sum is σ = 42040320. Its totient is φ = 19507680.

The previous prime is 30390817. The next prime is 30390887. The reversal of 30390819 is 91809303.

It is not a de Polignac number, because 30390819 - 2¹ = 30390817 is a prime.

It is a super-2 number, since 2×30390819² = 1847203758981522, 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 30390819.

It is not an unprimeable number, because it can be changed into a prime (30390817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20584 + ... + 22010.

It is an arithmetic number, because the mean of its divisors is an integer number (2627520).

Almost surely, 2^30390819 is an apocalyptic number.

30390819 is a deficient number, since it is larger than the sum of its proper divisors (11649501).

30390819 is a wasteful number, since it uses less digits than its factorization.

30390819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 30390819 is about 5512.7868632843. The cubic root of 30390819 is about 312.0667284133.

The spelling of 30390819 in words is "thirty million, three hundred ninety thousand, eight hundred nineteen".