30405144 has 64 divisors (see below), whose sum is σ = 94775040. Its totient is φ = 7896960.

The previous prime is 30405139. The next prime is 30405161. The reversal of 30405144 is 44150403.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 30405144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6379 + ... + 10074.

It is an arithmetic number, because the mean of its divisors is an integer number (1480860).

Almost surely, 2^30405144 is an apocalyptic number.

It is an amenable number.

30405144 is an abundant number, since it is smaller than the sum of its proper divisors (64369896).

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

30405144 is a wasteful number, since it uses less digits than its factorization.

30405144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16480 (or 16476 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 30405144 is about 5514.0859623332. The cubic root of 30405144 is about 312.1157525795.

Adding to 30405144 its reverse (44150403), we get a palindrome (74555547).

The spelling of 30405144 in words is "thirty million, four hundred five thousand, one hundred forty-four".