1979993 has 2 divisors, whose sum is σ = 1979994. Its totient is φ = 1979992.

The previous prime is 1979947. The next prime is 1980019. The reversal of 1979993 is 3999791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1885129 + 94864 = 1373^2 + 308^2 .

It is an emirp because it is prime and its reverse (3999791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1979993 - 2¹⁶ = 1914457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1979893) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989996 + 989997.

It is an arithmetic number, because the mean of its divisors is an integer number (989997).

2^1979993 is an apocalyptic number.

It is an amenable number.

1979993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979993 is an equidigital number, since it uses as much as digits as its factorization.

1979993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 137781, while the sum is 47.

The square root of 1979993 is about 1407.1222406031. The cubic root of 1979993 is about 125.5705755852.

The spelling of 1979993 in words is "one million, nine hundred seventy-nine thousand, nine hundred ninety-three".