1979999 has 8 divisors (see below), whose sum is σ = 2300448. Its totient is φ = 1668960.

The previous prime is 1979993. The next prime is 1980019. The reversal of 1979999 is 9999791.

1979999 = 297² + 298² + ... + 317².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1979999 is a prime.

It is an Ulam number.

It is a Duffinian number.

1979999 is a modest number, since divided by 9999 gives 197 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1979999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1892 + ... + 2745.

It is an arithmetic number, because the mean of its divisors is an integer number (287556).

2^1979999 is an apocalyptic number.

1979999 is a deficient number, since it is larger than the sum of its proper divisors (320449).

1979999 is an equidigital number, since it uses as much as digits as its factorization.

1979999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4705.

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

The square root of 1979999 is about 1407.1243726125. The cubic root of 1979999 is about 125.5707024245.

The spelling of 1979999 in words is "one million, nine hundred seventy-nine thousand, nine hundred ninety-nine".