43920649 has 2 divisors, whose sum is σ = 43920650. Its totient is φ = 43920648.

The previous prime is 43920637. The next prime is 43920677. The reversal of 43920649 is 94602934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35188624 + 8732025 = 5932^2 + 2955^2 .

It is a cyclic number.

It is not a de Polignac number, because 43920649 - 2¹¹ = 43918601 is a prime.

It is not a weakly prime, because it can be changed into another prime (43920619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21960324 + 21960325.

It is an arithmetic number, because the mean of its divisors is an integer number (21960325).

Almost surely, 2^43920649 is an apocalyptic number.

It is an amenable number.

43920649 is a deficient number, since it is larger than the sum of its proper divisors (1).

43920649 is an equidigital number, since it uses as much as digits as its factorization.

43920649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 43920649 is about 6627.2655748808. The cubic root of 43920649 is about 352.8224810764.

The spelling of 43920649 in words is "forty-three million, nine hundred twenty thousand, six hundred forty-nine".