43701649 has 4 divisors (see below), whose sum is σ = 43720164. Its totient is φ = 43683136.

The previous prime is 43701643. The next prime is 43701677. The reversal of 43701649 is 94610734.

It is a happy number.

43701649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94610734 = 2 ⋅47305367.

It can be written as a sum of positive squares in 2 ways, for example, as 24059025 + 19642624 = 4905^2 + 4432^2 .

It is a cyclic number.

It is not a de Polignac number, because 43701649 - 2²³ = 35313041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43701643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5092 + ... + 10645.

It is an arithmetic number, because the mean of its divisors is an integer number (10930041).

Almost surely, 2^43701649 is an apocalyptic number.

It is an amenable number.

43701649 is a deficient number, since it is larger than the sum of its proper divisors (18515).

43701649 is a wasteful number, since it uses less digits than its factorization.

43701649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18514.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 43701649 is about 6610.7222752132. The cubic root of 43701649 is about 352.2350815388.

The spelling of 43701649 in words is "forty-three million, seven hundred one thousand, six hundred forty-nine".