30123440 has 40 divisors (see below), whose sum is σ = 70435968. Its totient is φ = 11980800.

The previous prime is 30123437. The next prime is 30123461. The reversal of 30123440 is 4432103.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14465 + ... + 16415.

Almost surely, 2^30123440 is an apocalyptic number.

It is an amenable number.

30123440 is an abundant number, since it is smaller than the sum of its proper divisors (40312528).

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

30123440 is a wasteful number, since it uses less digits than its factorization.

30123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157 (or 2151 counting only the distinct ones).

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

The square root of 30123440 is about 5488.4824860794. The cubic root of 30123440 is about 311.1488416069.

Adding to 30123440 its reverse (4432103), we get a palindrome (34555543).

The spelling of 30123440 in words is "thirty million, one hundred twenty-three thousand, four hundred forty".