40764991 has 2 divisors, whose sum is σ = 40764992. Its totient is φ = 40764990.

The previous prime is 40764979. The next prime is 40765007. The reversal of 40764991 is 19946704.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40764991 - 2⁵ = 40764959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40764931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20382495 + 20382496.

It is an arithmetic number, because the mean of its divisors is an integer number (20382496).

Almost surely, 2^40764991 is an apocalyptic number.

40764991 is a deficient number, since it is larger than the sum of its proper divisors (1).

40764991 is an equidigital number, since it uses as much as digits as its factorization.

40764991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 40764991 is about 6384.7467451732. The cubic root of 40764991 is about 344.1616302603.

The spelling of 40764991 in words is "forty million, seven hundred sixty-four thousand, nine hundred ninety-one".