43640461 has 8 divisors (see below), whose sum is σ = 44213400. Its totient is φ = 43071552.

The previous prime is 43640449. The next prime is 43640477. The reversal of 43640461 is 16404634.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5262436 + 38378025 = 2294^2 + 6195^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43640461 - 2²¹ = 41543309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43640491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24931 + ... + 26623.

It is an arithmetic number, because the mean of its divisors is an integer number (5526675).

Almost surely, 2^43640461 is an apocalyptic number.

It is an amenable number.

43640461 is a deficient number, since it is larger than the sum of its proper divisors (572939).

43640461 is a wasteful number, since it uses less digits than its factorization.

43640461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 43640461 is about 6606.0927180899. The cubic root of 43640461 is about 352.0706130935.

The spelling of 43640461 in words is "forty-three million, six hundred forty thousand, four hundred sixty-one".