30438644 has 6 divisors (see below), whose sum is σ = 53267634. Its totient is φ = 15219320.

The previous prime is 30438641. The next prime is 30438647. The reversal of 30438644 is 44683403.

It is an interprime number because it is at equal distance from previous prime (30438641) and next prime (30438647).

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 14915044 = 3940^2 + 3862^2 .

It is a super-2 number, since 2×30438644² = 1853022097117472, 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 30438644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30438641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3804827 + ... + 3804834.

It is an arithmetic number, because the mean of its divisors is an integer number (8877939).

Almost surely, 2^30438644 is an apocalyptic number.

It is an amenable number.

30438644 is a deficient number, since it is larger than the sum of its proper divisors (22828990).

30438644 is a wasteful number, since it uses less digits than its factorization.

30438644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7609665 (or 7609663 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 30438644 is about 5517.1228008809. The cubic root of 30438644 is about 312.2303388922.

The spelling of 30438644 in words is "thirty million, four hundred thirty-eight thousand, six hundred forty-four".