40823921 has 2 divisors, whose sum is σ = 40823922. Its totient is φ = 40823920.

The previous prime is 40823911. The next prime is 40823963. The reversal of 40823921 is 12932804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40768225 + 55696 = 6385^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 40823921 - 2⁶ = 40823857 is a prime.

It is not a weakly prime, because it can be changed into another prime (40823911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20411960 + 20411961.

It is an arithmetic number, because the mean of its divisors is an integer number (20411961).

Almost surely, 2^40823921 is an apocalyptic number.

It is an amenable number.

40823921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40823921 is an equidigital number, since it uses as much as digits as its factorization.

40823921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 40823921 is about 6389.3599835977. The cubic root of 40823921 is about 344.3273907919.

The spelling of 40823921 in words is "forty million, eight hundred twenty-three thousand, nine hundred twenty-one".