30400434 has 80 divisors (see below), whose sum is σ = 73180800. Its totient is φ = 9408960.

The previous prime is 30400423. The next prime is 30400451. The reversal of 30400434 is 43400403.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 152667 + ... + 152865.

It is an arithmetic number, because the mean of its divisors is an integer number (914760).

Almost surely, 2^30400434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30400434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36590400).

30400434 is an abundant number, since it is smaller than the sum of its proper divisors (42780366).

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

30400434 is a wasteful number, since it uses less digits than its factorization.

30400434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 30400434 is about 5513.6588577822. The cubic root of 30400434 is about 312.0996353384.

Adding to 30400434 its reverse (43400403), we get a palindrome (73800837).

The spelling of 30400434 in words is "thirty million, four hundred thousand, four hundred thirty-four".