40398379843 has 2 divisors, whose sum is σ = 40398379844. Its totient is φ = 40398379842.

The previous prime is 40398379751. The next prime is 40398379873. The reversal of 40398379843 is 34897389304.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40398379843 is a prime.

It is not a weakly prime, because it can be changed into another prime (40398379873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20199189921 + 20199189922.

It is an arithmetic number, because the mean of its divisors is an integer number (20199189922).

Almost surely, 2^40398379843 is an apocalyptic number.

40398379843 is a deficient number, since it is larger than the sum of its proper divisors (1).

40398379843 is an equidigital number, since it uses as much as digits as its factorization.

40398379843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 58.

The spelling of 40398379843 in words is "forty billion, three hundred ninety-eight million, three hundred seventy-nine thousand, eight hundred forty-three".