30213440 has 56 divisors (see below), whose sum is σ = 72420480. Its totient is φ = 12005888.

The previous prime is 30213431. The next prime is 30213493. The reversal of 30213440 is 4431203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83981 + ... + 84339.

Almost surely, 2^30213440 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 30213440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36210240).

30213440 is an abundant number, since it is smaller than the sum of its proper divisors (42207040).

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

30213440 is a wasteful number, since it uses less digits than its factorization.

30213440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 30213440 is about 5496.6753587964. The cubic root of 30213440 is about 311.4584073283.

Adding to 30213440 its reverse (4431203), we get a palindrome (34644643).

The spelling of 30213440 in words is "thirty million, two hundred thirteen thousand, four hundred forty".