43746940537609 has 27 divisors (see below), whose sum is σ = 46839596072589. Its totient is φ = 40852411228440.

The previous prime is 43746940537537. The next prime is 43746940537633. The reversal of 43746940537609 is 90673504964734.

The square root of 43746940537609 is 6614147.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 43746940537609 - 2⁷ = 43746940537481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43746940537639) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8922481852 + ... + 8922486754.

Almost surely, 2^{43746940537609} is an apocalyptic number.

43746940537609 is the 6614147-th square number.

43746940537609 is the 3307074-th centered octagonal number.

It is an amenable number.

43746940537609 is a deficient number, since it is larger than the sum of its proper divisors (3092655534980).

43746940537609 is an frugal number, since it uses more digits than its factorization.

43746940537609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9986 (or 4993 counting only the distinct ones).

The product of its (nonzero) digits is 411505920, while the sum is 67.

The spelling of 43746940537609 in words is "forty-three trillion, seven hundred forty-six billion, nine hundred forty million, five hundred thirty-seven thousand, six hundred nine".