30440040 has 128 divisors (see below), whose sum is σ = 97977600. Its totient is φ = 7546880.

The previous prime is 30440029. The next prime is 30440041. The reversal of 30440040 is 4004403.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (30440041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113026 + ... + 113294.

It is an arithmetic number, because the mean of its divisors is an integer number (765450).

Almost surely, 2^30440040 is an apocalyptic number.

30440040 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 30440040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48988800).

30440040 is an abundant number, since it is smaller than the sum of its proper divisors (67537560).

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

30440040 is a wasteful number, since it uses less digits than its factorization.

30440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 30440040 is about 5517.2493146495. The cubic root of 30440040 is about 312.2351120668.

Adding to 30440040 its reverse (4004403), we get a palindrome (34444443).

The spelling of 30440040 in words is "thirty million, four hundred forty thousand, forty".