1973386649 has 4 divisors (see below), whose sum is σ = 2125185636. Its totient is φ = 1821587664.

The previous prime is 1973386643. The next prime is 1973386651. The reversal of 1973386649 is 9466833791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9466833791 = 89 ⋅106368919.

It can be written as a sum of positive squares in 2 ways, for example, as 855153049 + 1118233600 = 29243^2 + 33440^2 .

It is not a de Polignac number, because 1973386649 - 2⁴ = 1973386633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1973386594 and 1973386603.

It is not an unprimeable number, because it can be changed into a prime (1973386643) 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, 75899474 + ... + 75899499.

It is an arithmetic number, because the mean of its divisors is an integer number (531296409).

Almost surely, 2^1973386649 is an apocalyptic number.

It is an amenable number.

1973386649 is a deficient number, since it is larger than the sum of its proper divisors (151798987).

1973386649 is a wasteful number, since it uses less digits than its factorization.

1973386649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151798986.

The product of its digits is 5878656, while the sum is 56.

The square root of 1973386649 is about 44422.8167612095. The cubic root of 1973386649 is about 1254.3076235715.

The spelling of 1973386649 in words is "one billion, nine hundred seventy-three million, three hundred eighty-six thousand, six hundred forty-nine".