40123399 has 2 divisors, whose sum is σ = 40123400. Its totient is φ = 40123398.

The previous prime is 40123351. The next prime is 40123403. The reversal of 40123399 is 99332104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40123399 - 2¹⁷ = 39992327 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40123399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40123099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20061699 + 20061700.

It is an arithmetic number, because the mean of its divisors is an integer number (20061700).

Almost surely, 2^40123399 is an apocalyptic number.

40123399 is a deficient number, since it is larger than the sum of its proper divisors (1).

40123399 is an equidigital number, since it uses as much as digits as its factorization.

40123399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 40123399 is about 6334.3033555396. The cubic root of 40123399 is about 342.3465105134.

The spelling of 40123399 in words is "forty million, one hundred twenty-three thousand, three hundred ninety-nine".