1209994973 has 4 divisors (see below), whose sum is σ = 1319994528. Its totient is φ = 1099995420.

The previous prime is 1209994967. The next prime is 1209994991. The reversal of 1209994973 is 3794999021.

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.

It is a cyclic number.

It is not a de Polignac number, because 1209994973 - 2⁶ = 1209994909 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 (1209991973) 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, 54999761 + ... + 54999782.

It is an arithmetic number, because the mean of its divisors is an integer number (329998632).

Almost surely, 2^1209994973 is an apocalyptic number.

It is an amenable number.

1209994973 is a deficient number, since it is larger than the sum of its proper divisors (109999555).

1209994973 is a wasteful number, since it uses less digits than its factorization.

1209994973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109999554.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The square root of 1209994973 is about 34784.9820037326. The cubic root of 1209994973 is about 1065.6007610669.

The spelling of 1209994973 in words is "one billion, two hundred nine million, nine hundred ninety-four thousand, nine hundred seventy-three".