30121040 has 40 divisors (see below), whose sum is σ = 71031168. Its totient is φ = 11876480.

The previous prime is 30121001. The next prime is 30121043. The reversal of 30121040 is 4012103.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30121043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3029 + ... + 8331.

Almost surely, 2^30121040 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 30121040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35515584).

30121040 is an abundant number, since it is smaller than the sum of its proper divisors (40910128).

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

30121040 is a wasteful number, since it uses less digits than its factorization.

30121040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387 (or 5381 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 30121040 is about 5488.2638420542. The cubic root of 30121040 is about 311.1405780857.

Adding to 30121040 its reverse (4012103), we get a palindrome (34133143).

The spelling of 30121040 in words is "thirty million, one hundred twenty-one thousand, forty".