30749812 has 12 divisors (see below), whose sum is σ = 55266820. Its totient is φ = 14959296.

The previous prime is 30749801. The next prime is 30749813. The reversal of 30749812 is 21894703.

It can be written as a sum of positive squares in 2 ways, for example, as 20738916 + 10010896 = 4554^2 + 3164^2 .

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30749813) 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 in 3 ways as a sum of consecutive naturals, for example, 103737 + ... + 104032.

Almost surely, 2^30749812 is an apocalyptic number.

It is an amenable number.

30749812 is a deficient number, since it is larger than the sum of its proper divisors (24517008).

30749812 is a wasteful number, since it uses less digits than its factorization.

30749812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207810 (or 207808 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 30749812 is about 5545.2513017897. The cubic root of 30749812 is about 313.2906893326.

The spelling of 30749812 in words is "thirty million, seven hundred forty-nine thousand, eight hundred twelve".