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1999979 is a prime number
BaseRepresentation
bin111101000010001101011
310202121110022
413220101223
51002444404
6110511055
722666562
oct7502153
93677408
101999979
111146683
1280548b
13550427
143a0bd9
152978be
hex1e846b

1999979 has 2 divisors, whose sum is σ = 1999980. Its totient is φ = 1999978.

The previous prime is 1999969. The next prime is 1999993. The reversal of 1999979 is 9799991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1999979 - 212 = 1995883 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 1999979.

It is not a weakly prime, because it can be changed into another prime (1999969) 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, 999989 + 999990.

It is an arithmetic number, because the mean of its divisors is an integer number (999990).

21999979 is an apocalyptic number.

1999979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999979 is an equidigital number, since it uses as much as digits as its factorization.

1999979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 413343, while the sum is 53.

The square root of 1999979 is about 1414.2061377324. The cubic root of 1999979 is about 125.9916640156.

The spelling of 1999979 in words is "one million, nine hundred ninety-nine thousand, nine hundred seventy-nine".