30453840 has 160 divisors (see below), whose sum is σ = 109635840. Its totient is φ = 7755264.

The previous prime is 30453833. The next prime is 30453859. The reversal of 30453840 is 4835403.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49374 + ... + 49986.

It is an arithmetic number, because the mean of its divisors is an integer number (685224).

Almost surely, 2^30453840 is an apocalyptic number.

30453840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30453840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54817920).

30453840 is an abundant number, since it is smaller than the sum of its proper divisors (79182000).

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

30453840 is a wasteful number, since it uses less digits than its factorization.

30453840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 30453840 is about 5518.4997961403. The cubic root of 30453840 is about 312.2822888946.

The spelling of 30453840 in words is "thirty million, four hundred fifty-three thousand, eight hundred forty".