30031440 has 40 divisors (see below), whose sum is σ = 93098208. Its totient is φ = 8008320.

The previous prime is 30031439. The next prime is 30031447. The reversal of 30031440 is 4413003.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30031447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62326 + ... + 62805.

Almost surely, 2^30031440 is an apocalyptic number.

30031440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30031440 is an abundant number, since it is smaller than the sum of its proper divisors (63066768).

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

30031440 is a wasteful number, since it uses less digits than its factorization.

30031440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125147 (or 125141 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 30031440 is about 5480.0948896894. The cubic root of 30031440 is about 310.8317586876.

Adding to 30031440 its reverse (4413003), we get a palindrome (34444443).

The spelling of 30031440 in words is "thirty million, thirty-one thousand, four hundred forty".