30421540 has 48 divisors (see below), whose sum is σ = 66608640. Its totient is φ = 11658240.

The previous prime is 30421537. The next prime is 30421543. The reversal of 30421540 is 4512403.

It is an interprime number because it is at equal distance from previous prime (30421537) and next prime (30421543).

It is not an unprimeable number, because it can be changed into a prime (30421543) 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, 86004 + ... + 86356.

It is an arithmetic number, because the mean of its divisors is an integer number (1387680).

Almost surely, 2^30421540 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 30421540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33304320).

30421540 is an abundant number, since it is smaller than the sum of its proper divisors (36187100).

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

30421540 is a wasteful number, since it uses less digits than its factorization.

30421540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 30421540 is about 5515.5724997501. The cubic root of 30421540 is about 312.1718453939.

Adding to 30421540 its reverse (4512403), we get a palindrome (34933943).

The spelling of 30421540 in words is "thirty million, four hundred twenty-one thousand, five hundred forty".