30121740 has 144 divisors (see below), whose sum is σ = 103229280. Its totient is φ = 7286400.

The previous prime is 30121723. The next prime is 30121753. The reversal of 30121740 is 4712103.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65110 + ... + 65570.

It is an arithmetic number, because the mean of its divisors is an integer number (716870).

Almost surely, 2^30121740 is an apocalyptic number.

30121740 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30121740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51614640).

30121740 is an abundant number, since it is smaller than the sum of its proper divisors (73107540).

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

30121740 is a wasteful number, since it uses less digits than its factorization.

30121740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 30121740 is about 5488.3276141280. The cubic root of 30121740 is about 311.1429883248.

Adding to 30121740 its reverse (4712103), we get a palindrome (34833843).

The spelling of 30121740 in words is "thirty million, one hundred twenty-one thousand, seven hundred forty".