43740781 has 12 divisors (see below), whose sum is σ = 51123072. Its totient is φ = 37314648.

The previous prime is 43740731. The next prime is 43740791. The reversal of 43740781 is 18704734.

It is not a de Polignac number, because 43740781 - 2¹¹ = 43738733 is a prime.

It is a super-2 number, since 2×43740781² = 3826511844979922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43740731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8926 + ... + 12928.

It is an arithmetic number, because the mean of its divisors is an integer number (4260256).

Almost surely, 2^43740781 is an apocalyptic number.

It is an amenable number.

43740781 is a deficient number, since it is larger than the sum of its proper divisors (7382291).

43740781 is a wasteful number, since it uses less digits than its factorization.

43740781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240 (or 4233 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 43740781 is about 6613.6813500501. The cubic root of 43740781 is about 352.3401847514.

It can be divided in two parts, 43740 and 781, that added together give a square (44521 = 211²).

The spelling of 43740781 in words is "forty-three million, seven hundred forty thousand, seven hundred eighty-one".