40780393 has 2 divisors, whose sum is σ = 40780394. Its totient is φ = 40780392.

The previous prime is 40780381. The next prime is 40780417. The reversal of 40780393 is 39308704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37124649 + 3655744 = 6093^2 + 1912^2 .

It is a cyclic number.

It is not a de Polignac number, because 40780393 - 2⁵ = 40780361 is a prime.

It is equal to p_2478265 and since 40780393 and 2478265 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40780303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20390196 + 20390197.

It is an arithmetic number, because the mean of its divisors is an integer number (20390197).

Almost surely, 2^40780393 is an apocalyptic number.

It is an amenable number.

40780393 is a deficient number, since it is larger than the sum of its proper divisors (1).

40780393 is an equidigital number, since it uses as much as digits as its factorization.

40780393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 40780393 is about 6385.9527871728. The cubic root of 40780393 is about 344.2049689999.

The spelling of 40780393 in words is "forty million, seven hundred eighty thousand, three hundred ninety-three".