43666740 has 72 divisors (see below), whose sum is σ = 142652328. Its totient is φ = 10748160.

The previous prime is 43666739. The next prime is 43666813. The reversal of 43666740 is 4766634.

It can be written as a sum of positive squares in 4 ways, for example, as 580644 + 43086096 = 762^2 + 6564^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 43666695 and 43666704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6991 + ... + 11670.

Almost surely, 2^43666740 is an apocalyptic number.

It is an amenable number.

43666740 is an abundant number, since it is smaller than the sum of its proper divisors (98985588).

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

43666740 is a wasteful number, since it uses less digits than its factorization.

43666740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18689 (or 18684 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 43666740 is about 6608.0814159633. The cubic root of 43666740 is about 352.1412677638.

It can be divided in two parts, 436 and 66740, that added together give a palindrome (67176).

The spelling of 43666740 in words is "forty-three million, six hundred sixty-six thousand, seven hundred forty".