43870840 has 64 divisors (see below), whose sum is σ = 107049600. Its totient is φ = 16084992.

The previous prime is 43870819. The next prime is 43870843. The reversal of 43870840 is 4807834.

It is a junction number, because it is equal to n+sod(n) for n = 43870796 and 43870805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43870843) 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, 124104 + ... + 124456.

It is an arithmetic number, because the mean of its divisors is an integer number (1672650).

Almost surely, 2^43870840 is an apocalyptic number.

43870840 is a gapful number since it is divisible by the number (40) 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 43870840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53524800).

43870840 is an abundant number, since it is smaller than the sum of its proper divisors (63178760).

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

43870840 is a wasteful number, since it uses less digits than its factorization.

43870840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 43870840 is about 6623.5066241380. The cubic root of 43870840 is about 352.6890557376.

The spelling of 43870840 in words is "forty-three million, eight hundred seventy thousand, eight hundred forty".