43649542 has 4 divisors (see below), whose sum is σ = 65474316. Its totient is φ = 21824770.

The previous prime is 43649539. The next prime is 43649549. The reversal of 43649542 is 24594634.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24594634 = 2 ⋅12297317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43649549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10912384 + ... + 10912387.

It is an arithmetic number, because the mean of its divisors is an integer number (16368579).

Almost surely, 2^43649542 is an apocalyptic number.

43649542 is a deficient number, since it is larger than the sum of its proper divisors (21824774).

43649542 is a wasteful number, since it uses less digits than its factorization.

43649542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21824773.

The product of its digits is 103680, while the sum is 37.

The square root of 43649542 is about 6606.7800023915. The cubic root of 43649542 is about 352.0950318052.

The spelling of 43649542 in words is "forty-three million, six hundred forty-nine thousand, five hundred forty-two".