40764821 has 2 divisors, whose sum is σ = 40764822. Its totient is φ = 40764820.

The previous prime is 40764799. The next prime is 40764883. The reversal of 40764821 is 12846704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40462321 + 302500 = 6361^2 + 550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40764821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40164821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20382410 + 20382411.

It is an arithmetic number, because the mean of its divisors is an integer number (20382411).

Almost surely, 2^40764821 is an apocalyptic number.

It is an amenable number.

40764821 is a deficient number, since it is larger than the sum of its proper divisors (1).

40764821 is an equidigital number, since it uses as much as digits as its factorization.

40764821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 40764821 is about 6384.7334321802. The cubic root of 40764821 is about 344.1611518469.

The spelling of 40764821 in words is "forty million, seven hundred sixty-four thousand, eight hundred twenty-one".