40201979 has 2 divisors, whose sum is σ = 40201980. Its totient is φ = 40201978.

The previous prime is 40201969. The next prime is 40201981. The reversal of 40201979 is 97910204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40201979 is a prime.

Together with 40201981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40201919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20100989 + 20100990.

It is an arithmetic number, because the mean of its divisors is an integer number (20100990).

Almost surely, 2^40201979 is an apocalyptic number.

40201979 is a deficient number, since it is larger than the sum of its proper divisors (1).

40201979 is an equidigital number, since it uses as much as digits as its factorization.

40201979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 40201979 is about 6340.5030557520. The cubic root of 40201979 is about 342.5698552172.

The spelling of 40201979 in words is "forty million, two hundred one thousand, nine hundred seventy-nine".