43899840 has 112 divisors (see below), whose sum is σ = 154899360. Its totient is φ = 11704320.

The previous prime is 43899839. The next prime is 43899841. The reversal of 43899840 is 4899834.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (43899839) and next prime (43899841).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43899841) 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, 6100 + ... + 11180.

It is an arithmetic number, because the mean of its divisors is an integer number (1383030).

Almost surely, 2^43899840 is an apocalyptic number.

43899840 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 43899840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77449680).

43899840 is an abundant number, since it is smaller than the sum of its proper divisors (110999520).

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

43899840 is a wasteful number, since it uses less digits than its factorization.

43899840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5107 (or 5091 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 43899840 is about 6625.6954351977. The cubic root of 43899840 is about 352.7667514597.

The spelling of 43899840 in words is "forty-three million, eight hundred ninety-nine thousand, eight hundred forty".