39946993 has 4 divisors (see below), whose sum is σ = 39963888. Its totient is φ = 39930100.

The previous prime is 39946981. The next prime is 39947051. The reversal of 39946993 is 39964993.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39946993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39946993.

It is not an unprimeable number, because it can be changed into a prime (39946913) 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, 4183 + ... + 9868.

It is an arithmetic number, because the mean of its divisors is an integer number (9990972).

Almost surely, 2^39946993 is an apocalyptic number.

It is an amenable number.

39946993 is a deficient number, since it is larger than the sum of its proper divisors (16895).

39946993 is a wasteful number, since it uses less digits than its factorization.

39946993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16894.

The product of its digits is 1417176, while the sum is 52.

The square root of 39946993 is about 6320.3633598077. The cubic root of 39946993 is about 341.8440547307.

The spelling of 39946993 in words is "thirty-nine million, nine hundred forty-six thousand, nine hundred ninety-three".