40638993 has 16 divisors (see below), whose sum is σ = 58317696. Its totient is φ = 25079040.

The previous prime is 40638991. The next prime is 40639007. The reversal of 40638993 is 39983604.

It is not a de Polignac number, because 40638993 - 2¹ = 40638991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40638991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3421 + ... + 9642.

It is an arithmetic number, because the mean of its divisors is an integer number (3644856).

Almost surely, 2^40638993 is an apocalyptic number.

It is an amenable number.

40638993 is a deficient number, since it is larger than the sum of its proper divisors (17678703).

40638993 is a wasteful number, since it uses less digits than its factorization.

40638993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13144.

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

The square root of 40638993 is about 6374.8719987150. The cubic root of 40638993 is about 343.8066816504.

The spelling of 40638993 in words is "forty million, six hundred thirty-eight thousand, nine hundred ninety-three".