39661043 has 4 divisors (see below), whose sum is σ = 39747168. Its totient is φ = 39574920.

The previous prime is 39661033. The next prime is 39661049. The reversal of 39661043 is 34016693.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39661043 - 2⁶ = 39660979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39661049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42368 + ... + 43293.

It is an arithmetic number, because the mean of its divisors is an integer number (9936792).

Almost surely, 2^39661043 is an apocalyptic number.

39661043 is a deficient number, since it is larger than the sum of its proper divisors (86125).

39661043 is an equidigital number, since it uses as much as digits as its factorization.

39661043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86124.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 39661043 is about 6297.7014060687. The cubic root of 39661043 is about 341.0264339120.

The spelling of 39661043 in words is "thirty-nine million, six hundred sixty-one thousand, forty-three".