39943993 has 4 divisors (see below), whose sum is σ = 40540240. Its totient is φ = 39347748.

The previous prime is 39943973. The next prime is 39943997. The reversal of 39943993 is 39934993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39934993 = 7 ⋅5704999.

It is a cyclic number.

It is not a de Polignac number, because 39943993 - 2⁹ = 39943481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39943997) 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, 298023 + ... + 298156.

It is an arithmetic number, because the mean of its divisors is an integer number (10135060).

Almost surely, 2^39943993 is an apocalyptic number.

It is an amenable number.

39943993 is a deficient number, since it is larger than the sum of its proper divisors (596247).

39943993 is an equidigital number, since it uses as much as digits as its factorization.

39943993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596246.

The product of its digits is 708588, while the sum is 49.

The square root of 39943993 is about 6320.1260272245. The cubic root of 39943993 is about 341.8354970750.

The spelling of 39943993 in words is "thirty-nine million, nine hundred forty-three thousand, nine hundred ninety-three".