1979503693 has 4 divisors (see below), whose sum is σ = 1987206300. Its totient is φ = 1971801088.

The previous prime is 1979503651. The next prime is 1979503703. The reversal of 1979503693 is 3963059791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3963059791 = 971 ⋅4081421.

It can be written as a sum of positive squares in 2 ways, for example, as 1102040809 + 877462884 = 33197^2 + 29622^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979503693 - 2¹³ = 1979495501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1979503693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979503193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3850918 + ... + 3851431.

It is an arithmetic number, because the mean of its divisors is an integer number (496801575).

Almost surely, 2^1979503693 is an apocalyptic number.

It is an amenable number.

1979503693 is a deficient number, since it is larger than the sum of its proper divisors (7702607).

1979503693 is an equidigital number, since it uses as much as digits as its factorization.

1979503693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7702606.

The product of its (nonzero) digits is 1377810, while the sum is 52.

The square root of 1979503693 is about 44491.6137378720. The cubic root of 1979503693 is about 1255.6023083089.

The spelling of 1979503693 in words is "one billion, nine hundred seventy-nine million, five hundred three thousand, six hundred ninety-three".