40039993 has 8 divisors (see below), whose sum is σ = 45978560. Its totient is φ = 34156080.

The previous prime is 40039991. The next prime is 40039999. The reversal of 40039993 is 39993004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40039993 - 2¹ = 40039991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40039991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12078 + ... + 15031.

It is an arithmetic number, because the mean of its divisors is an integer number (5747320).

Almost surely, 2^40039993 is an apocalyptic number.

It is an amenable number.

40039993 is a deficient number, since it is larger than the sum of its proper divisors (5938567).

40039993 is a wasteful number, since it uses less digits than its factorization.

40039993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27327.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 40039993 is about 6327.7162547004. The cubic root of 40039993 is about 342.1091298170.

The spelling of 40039993 in words is "forty million, thirty-nine thousand, nine hundred ninety-three".