30523440 has 80 divisors (see below), whose sum is σ = 95752800. Its totient is φ = 8042496.

The previous prime is 30523439. The next prime is 30523453. The reversal of 30523440 is 4432503.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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, 20646 + ... + 22074.

It is an arithmetic number, because the mean of its divisors is an integer number (1196910).

Almost surely, 2^30523440 is an apocalyptic number.

30523440 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 30523440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47876400).

30523440 is an abundant number, since it is smaller than the sum of its proper divisors (65229360).

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

30523440 is a wasteful number, since it uses less digits than its factorization.

30523440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534 (or 1528 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 30523440 is about 5524.8022589048. The cubic root of 30523440 is about 312.5200072524.

Adding to 30523440 its reverse (4432503), we get a palindrome (34955943).

The spelling of 30523440 in words is "thirty million, five hundred twenty-three thousand, four hundred forty".