1988079 has 4 divisors (see below), whose sum is σ = 2650776. Its totient is φ = 1325384.

The previous prime is 1988057. The next prime is 1988087. The reversal of 1988079 is 9708891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9708891 = 3 ⋅3236297.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1988079 is a prime.

It is a super-2 number, since 2×1988079² = 7904916220482, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1988079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331344 + ... + 331349.

It is an arithmetic number, because the mean of its divisors is an integer number (662694).

2^1988079 is an apocalyptic number.

1988079 is a deficient number, since it is larger than the sum of its proper divisors (662697).

1988079 is an equidigital number, since it uses as much as digits as its factorization.

1988079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662696.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1988079 is about 1409.9925531718. The cubic root of 1988079 is about 125.7412806674.

The spelling of 1988079 in words is "one million, nine hundred eighty-eight thousand, seventy-nine".