43690640 has 80 divisors (see below), whose sum is σ = 118087680. Its totient is φ = 14722560.

The previous prime is 43690637. The next prime is 43690651. The reversal of 43690640 is 4609634.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 43690597 and 43690606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33521 + ... + 34799.

It is an arithmetic number, because the mean of its divisors is an integer number (1476096).

Almost surely, 2^43690640 is an apocalyptic number.

43690640 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 43690640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59043840).

43690640 is an abundant number, since it is smaller than the sum of its proper divisors (74397040).

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

43690640 is a wasteful number, since it uses less digits than its factorization.

43690640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 43690640 is about 6609.8895603482. The cubic root of 43690640 is about 352.2055015590.

The spelling of 43690640 in words is "forty-three million, six hundred ninety thousand, six hundred forty".