1996781973 has 8 divisors (see below), whose sum is σ = 2662612128. Its totient is φ = 1331069904.

The previous prime is 1996781947. The next prime is 1996781977. The reversal of 1996781973 is 3791876991.

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

It is not a de Polignac number, because 1996781973 - 2²² = 1992587669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1996781977) 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, 23586 + ... + 67452.

It is an arithmetic number, because the mean of its divisors is an integer number (332826516).

Almost surely, 2^1996781973 is an apocalyptic number.

It is an amenable number.

1996781973 is a deficient number, since it is larger than the sum of its proper divisors (665830155).

1996781973 is a wasteful number, since it uses less digits than its factorization.

1996781973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59043.

The product of its digits is 5143824, while the sum is 60.

The square root of 1996781973 is about 44685.3664301861. The cubic root of 1996781973 is about 1259.2449438178.

The spelling of 1996781973 in words is "one billion, nine hundred ninety-six million, seven hundred eighty-one thousand, nine hundred seventy-three".