1973873639 has 4 divisors (see below), whose sum is σ = 2059694256. Its totient is φ = 1888053024.

The previous prime is 1973873623. The next prime is 1973873663. The reversal of 1973873639 is 9363783791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1973873639 - 2⁴ = 1973873623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1973873609) 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, 42910274 + ... + 42910319.

It is an arithmetic number, because the mean of its divisors is an integer number (514923564).

Almost surely, 2^1973873639 is an apocalyptic number.

1973873639 is a deficient number, since it is larger than the sum of its proper divisors (85820617).

1973873639 is an equidigital number, since it uses as much as digits as its factorization.

1973873639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85820616.

The product of its digits is 5143824, while the sum is 56.

The square root of 1973873639 is about 44428.2977279121. The cubic root of 1973873639 is about 1254.4107939309.

The spelling of 1973873639 in words is "one billion, nine hundred seventy-three million, eight hundred seventy-three thousand, six hundred thirty-nine".