40246991 has 2 divisors, whose sum is σ = 40246992. Its totient is φ = 40246990.

The previous prime is 40246963. The next prime is 40247047. The reversal of 40246991 is 19964204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40246991 - 2¹⁴ = 40230607 is a prime.

It is a Sophie Germain prime.

It is equal to p_2447729 and since 40246991 and 2447729 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40246931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20123495 + 20123496.

It is an arithmetic number, because the mean of its divisors is an integer number (20123496).

Almost surely, 2^40246991 is an apocalyptic number.

40246991 is a deficient number, since it is larger than the sum of its proper divisors (1).

40246991 is an equidigital number, since it uses as much as digits as its factorization.

40246991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 40246991 is about 6344.0516233713. The cubic root of 40246991 is about 342.6976598957.

The spelling of 40246991 in words is "forty million, two hundred forty-six thousand, nine hundred ninety-one".