40288393 has 2 divisors, whose sum is σ = 40288394. Its totient is φ = 40288392.

The previous prime is 40288357. The next prime is 40288397. The reversal of 40288393 is 39388204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31449664 + 8838729 = 5608^2 + 2973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40288393 is a prime.

It is a super-2 number, since 2×40288393² = 3246309221044898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40288397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20144196 + 20144197.

It is an arithmetic number, because the mean of its divisors is an integer number (20144197).

Almost surely, 2^40288393 is an apocalyptic number.

It is an amenable number.

40288393 is a deficient number, since it is larger than the sum of its proper divisors (1).

40288393 is an equidigital number, since it uses as much as digits as its factorization.

40288393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 40288393 is about 6347.3138413033. The cubic root of 40288393 is about 342.8151304259.

It can be divided in two parts, 4028 and 8393, that added together give a palindrome (12421).

The spelling of 40288393 in words is "forty million, two hundred eighty-eight thousand, three hundred ninety-three".