40302991 has 2 divisors, whose sum is σ = 40302992. Its totient is φ = 40302990.

The previous prime is 40302967. The next prime is 40303019. The reversal of 40302991 is 19920304.

It is a happy number.

It is an a-pointer prime, because the next prime (40303019) can be obtained adding 40302991 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40302991 - 2⁷ = 40302863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40302901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20151495 + 20151496.

It is an arithmetic number, because the mean of its divisors is an integer number (20151496).

Almost surely, 2^40302991 is an apocalyptic number.

40302991 is a deficient number, since it is larger than the sum of its proper divisors (1).

40302991 is an equidigital number, since it uses as much as digits as its factorization.

40302991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 40302991 is about 6348.4636724171. The cubic root of 40302991 is about 342.8565303643.

It can be divided in two parts, 4030 and 2991, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 40302991 in words is "forty million, three hundred two thousand, nine hundred ninety-one".