997243780939 has 8 divisors (see below), whose sum is σ = 1149793083360. Its totient is φ = 847215954816.

The previous prime is 997243780879. The next prime is 997243780993. The reversal of 997243780939 is 939087342799.

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

It is not a de Polignac number, because 997243780939 - 2⁷ = 997243780811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997243780999) 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, 630368224 + ... + 630369805.

It is an arithmetic number, because the mean of its divisors is an integer number (143724135420).

Almost surely, 2^997243780939 is an apocalyptic number.

997243780939 is a deficient number, since it is larger than the sum of its proper divisors (152549302421).

997243780939 is a wasteful number, since it uses less digits than its factorization.

997243780939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260738149.

The product of its (nonzero) digits is 185177664, while the sum is 70.

The spelling of 997243780939 in words is "nine hundred ninety-seven billion, two hundred forty-three million, seven hundred eighty thousand, nine hundred thirty-nine".