1996977953 has 4 divisors (see below), whose sum is σ = 1998535728. Its totient is φ = 1995420180.

The previous prime is 1996977943. The next prime is 1996977977. The reversal of 1996977953 is 3597796991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3597796991 = 38053 ⋅94547.

It is a cyclic number.

It is not a de Polignac number, because 1996977953 - 2⁶ = 1996977889 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 1996977953.

It is not an unprimeable number, because it can be changed into a prime (1996977943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776963 + ... + 779528.

It is an arithmetic number, because the mean of its divisors is an integer number (499633932).

Almost surely, 2^1996977953 is an apocalyptic number.

It is an amenable number.

1996977953 is a deficient number, since it is larger than the sum of its proper divisors (1557775).

1996977953 is a wasteful number, since it uses less digits than its factorization.

1996977953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557774.

The product of its digits is 28934010, while the sum is 65.

The square root of 1996977953 is about 44687.5592642964. The cubic root of 1996977953 is about 1259.2861398946.

The spelling of 1996977953 in words is "one billion, nine hundred ninety-six million, nine hundred seventy-seven thousand, nine hundred fifty-three".