40302491 has 2 divisors, whose sum is σ = 40302492. Its totient is φ = 40302490.

The previous prime is 40302473. The next prime is 40302499. The reversal of 40302491 is 19420304.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40302491 - 2¹⁰ = 40301467 is a prime.

It is not a weakly prime, because it can be changed into another prime (40302499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20151245 + 20151246.

It is an arithmetic number, because the mean of its divisors is an integer number (20151246).

Almost surely, 2^40302491 is an apocalyptic number.

40302491 is a deficient number, since it is larger than the sum of its proper divisors (1).

40302491 is an equidigital number, since it uses as much as digits as its factorization.

40302491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40302491 is about 6348.4242926887. The cubic root of 40302491 is about 342.8551125293.

Adding to 40302491 its reverse (19420304), we get a palindrome (59722795).

The spelling of 40302491 in words is "forty million, three hundred two thousand, four hundred ninety-one".