40423993 has 2 divisors, whose sum is σ = 40423994. Its totient is φ = 40423992.

The previous prime is 40423967. The next prime is 40424009. The reversal of 40423993 is 39932404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40411449 + 12544 = 6357^2 + 112^2 .

It is a cyclic number.

It is not a de Polignac number, because 40423993 - 2⁵ = 40423961 is a prime.

It is not a weakly prime, because it can be changed into another prime (40423793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20211996 + 20211997.

It is an arithmetic number, because the mean of its divisors is an integer number (20211997).

Almost surely, 2^40423993 is an apocalyptic number.

It is an amenable number.

40423993 is a deficient number, since it is larger than the sum of its proper divisors (1).

40423993 is an equidigital number, since it uses as much as digits as its factorization.

40423993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 40423993 is about 6357.9865523607. The cubic root of 40423993 is about 343.1993078747.

The spelling of 40423993 in words is "forty million, four hundred twenty-three thousand, nine hundred ninety-three".