40789993 has 2 divisors, whose sum is σ = 40789994. Its totient is φ = 40789992.

The previous prime is 40789981. The next prime is 40789999. The reversal of 40789993 is 39998704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21049744 + 19740249 = 4588^2 + 4443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40789993 is a prime.

It is not a weakly prime, because it can be changed into another prime (40789999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20394996 + 20394997.

It is an arithmetic number, because the mean of its divisors is an integer number (20394997).

Almost surely, 2^40789993 is an apocalyptic number.

It is an amenable number.

40789993 is a deficient number, since it is larger than the sum of its proper divisors (1).

40789993 is an equidigital number, since it uses as much as digits as its factorization.

40789993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 40789993 is about 6386.7043927209. The cubic root of 40789993 is about 344.2319763287.

The spelling of 40789993 in words is "forty million, seven hundred eighty-nine thousand, nine hundred ninety-three".