40386993 has 4 divisors (see below), whose sum is σ = 53849328. Its totient is φ = 26924660.

The previous prime is 40386979. The next prime is 40387003. The reversal of 40386993 is 39968304.

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 40386993 - 2⁴ = 40386977 is a prime.

It is a super-2 number, since 2×40386993² = 3262218407164098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40386923) 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, 6731163 + ... + 6731168.

It is an arithmetic number, because the mean of its divisors is an integer number (13462332).

Almost surely, 2^40386993 is an apocalyptic number.

It is an amenable number.

40386993 is a deficient number, since it is larger than the sum of its proper divisors (13462335).

40386993 is a wasteful number, since it uses less digits than its factorization.

40386993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13462334.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 40386993 is about 6355.0761600472. The cubic root of 40386993 is about 343.0945660314.

The spelling of 40386993 in words is "forty million, three hundred eighty-six thousand, nine hundred ninety-three".