43855420 has 48 divisors (see below), whose sum is σ = 110799360. Its totient is φ = 14243904.

The previous prime is 43855417. The next prime is 43855423. The reversal of 43855420 is 2455834.

It is an interprime number because it is at equal distance from previous prime (43855417) and next prime (43855423).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43855423) 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, 5584 + ... + 10903.

It is an arithmetic number, because the mean of its divisors is an integer number (2308320).

Almost surely, 2^43855420 is an apocalyptic number.

It is an amenable number.

43855420 is an abundant number, since it is smaller than the sum of its proper divisors (66943940).

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

43855420 is a wasteful number, since it uses less digits than its factorization.

43855420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16522 (or 16520 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 43855420 is about 6622.3424858580. The cubic root of 43855420 is about 352.6477291029.

The spelling of 43855420 in words is "forty-three million, eight hundred fifty-five thousand, four hundred twenty".