30281340 has 48 divisors (see below), whose sum is σ = 88478208. Its totient is φ = 7723584.

The previous prime is 30281333. The next prime is 30281341. The reversal of 30281340 is 4318203.

It is a happy number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30281341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9592 + ... + 12351.

It is an arithmetic number, because the mean of its divisors is an integer number (1843296).

Almost surely, 2^30281340 is an apocalyptic number.

30281340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30281340 is an abundant number, since it is smaller than the sum of its proper divisors (58196868).

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

30281340 is a wasteful number, since it uses less digits than its factorization.

30281340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21978 (or 21976 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 30281340 is about 5502.8483533530. The cubic root of 30281340 is about 311.6915508488.

Adding to 30281340 its reverse (4318203), we get a palindrome (34599543).

The spelling of 30281340 in words is "thirty million, two hundred eighty-one thousand, three hundred forty".