30000840 has 32 divisors (see below), whose sum is σ = 90002880. Its totient is φ = 8000192.

The previous prime is 30000827. The next prime is 30000853. The reversal of 30000840 is 4800003.

It is an interprime number because it is at equal distance from previous prime (30000827) and next prime (30000853).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124884 + ... + 125123.

It is an arithmetic number, because the mean of its divisors is an integer number (2812590).

Almost surely, 2^30000840 is an apocalyptic number.

30000840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30000840 is an abundant number, since it is smaller than the sum of its proper divisors (60002040).

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

30000840 is a wasteful number, since it uses less digits than its factorization.

30000840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250021 (or 250017 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 30000840 is about 5477.3022556730. The cubic root of 30000840 is about 310.7261506520.

Adding to 30000840 its reverse (4800003), we get a palindrome (34800843).

The spelling of 30000840 in words is "thirty million, eight hundred forty", and thus it is an aban number.