30840140 has 12 divisors (see below), whose sum is σ = 64764336. Its totient is φ = 12336048.

The previous prime is 30840109. The next prime is 30840143. The reversal of 30840140 is 4104803.

It is a super-2 number, since 2×30840140² = 1902228470439200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1542007 = 30840140 / (3 + 0 + 8 + 4 + 0 + 1 + 4 + 0).

It is not an unprimeable number, because it can be changed into a prime (30840143) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 770984 + ... + 771023.

It is an arithmetic number, because the mean of its divisors is an integer number (5397028).

Almost surely, 2^30840140 is an apocalyptic number.

It is an amenable number.

30840140 is an abundant number, since it is smaller than the sum of its proper divisors (33924196).

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

30840140 is a wasteful number, since it uses less digits than its factorization.

30840140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542016 (or 1542014 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 30840140 is about 5553.3899556937. The cubic root of 30840140 is about 313.5971546970.

Adding to 30840140 its reverse (4104803), we get a palindrome (34944943).

The spelling of 30840140 in words is "thirty million, eight hundred forty thousand, one hundred forty".