40722991 has 2 divisors, whose sum is σ = 40722992. Its totient is φ = 40722990.

The previous prime is 40722959. The next prime is 40723003. The reversal of 40722991 is 19922704.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40722991 - 2⁵ = 40722959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40722901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20361495 + 20361496.

It is an arithmetic number, because the mean of its divisors is an integer number (20361496).

Almost surely, 2^40722991 is an apocalyptic number.

40722991 is a deficient number, since it is larger than the sum of its proper divisors (1).

40722991 is an equidigital number, since it uses as much as digits as its factorization.

40722991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 40722991 is about 6381.4568085979. The cubic root of 40722991 is about 344.0433935479.

The spelling of 40722991 in words is "forty million, seven hundred twenty-two thousand, nine hundred ninety-one".