30121836 has 48 divisors (see below), whose sum is σ = 73513440. Its totient is φ = 9587200.

The previous prime is 30121829. The next prime is 30121837. The reversal of 30121836 is 63812103.

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

It is not an unprimeable number, because it can be changed into a prime (30121837) 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, 34720 + ... + 35576.

It is an arithmetic number, because the mean of its divisors is an integer number (1531530).

Almost surely, 2^30121836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30121836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36756720).

30121836 is an abundant number, since it is smaller than the sum of its proper divisors (43391604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30121836 is a wasteful number, since it uses less digits than its factorization.

30121836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994 (or 992 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 30121836 is about 5488.3363599546. The cubic root of 30121836 is about 311.1433188689.

Adding to 30121836 its reverse (63812103), we get a palindrome (93933939).

The spelling of 30121836 in words is "thirty million, one hundred twenty-one thousand, eight hundred thirty-six".