39946643 has 16 divisors (see below), whose sum is σ = 45517920. Its totient is φ = 34732800.

The previous prime is 39946591. The next prime is 39946649. The reversal of 39946643 is 34664993.

It is a cyclic number.

It is not a de Polignac number, because 39946643 - 2¹⁴ = 39930259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39946594 and 39946603.

It is not an unprimeable number, because it can be changed into a prime (39946649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24023 + ... + 25631.

It is an arithmetic number, because the mean of its divisors is an integer number (2844870).

Almost surely, 2^39946643 is an apocalyptic number.

39946643 is a deficient number, since it is larger than the sum of its proper divisors (5571277).

39946643 is a wasteful number, since it uses less digits than its factorization.

39946643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718.

The product of its digits is 419904, while the sum is 44.

The square root of 39946643 is about 6320.3356714656. The cubic root of 39946643 is about 341.8430563596.

The spelling of 39946643 in words is "thirty-nine million, nine hundred forty-six thousand, six hundred forty-three".