40505993 has 4 divisors (see below), whose sum is σ = 44188368. Its totient is φ = 36823620.

The previous prime is 40505981. The next prime is 40506001. The reversal of 40505993 is 39950504.

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 not a de Polignac number, because 40505993 - 2¹⁸ = 40243849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40505903) 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, 1841171 + ... + 1841192.

It is an arithmetic number, because the mean of its divisors is an integer number (11047092).

Almost surely, 2^40505993 is an apocalyptic number.

It is an amenable number.

40505993 is a deficient number, since it is larger than the sum of its proper divisors (3682375).

40505993 is a wasteful number, since it uses less digits than its factorization.

40505993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3682374.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 40505993 is about 6364.4318678104. The cubic root of 40505993 is about 343.4312108749.

The spelling of 40505993 in words is "forty million, five hundred five thousand, nine hundred ninety-three".