997447837 has 8 divisors (see below), whose sum is σ = 1045979640. Its totient is φ = 949858560.

The previous prime is 997447793. The next prime is 997447859. The reversal of 997447837 is 738744799.

It can be written as a sum of positive squares in 4 ways, for example, as 480749476 + 516698361 = 21926^2 + 22731^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 997447837 - 2⁷ = 997447709 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 (997457837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233464 + ... + 237697.

It is an arithmetic number, because the mean of its divisors is an integer number (130747455).

Almost surely, 2^997447837 is an apocalyptic number.

It is an amenable number.

997447837 is a deficient number, since it is larger than the sum of its proper divisors (48531803).

997447837 is a wasteful number, since it uses less digits than its factorization.

997447837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471263.

The product of its digits is 10668672, while the sum is 58.

The square root of 997447837 is about 31582.3975815643. The cubic root of 997447837 is about 999.1485542459.

The spelling of 997447837 in words is "nine hundred ninety-seven million, four hundred forty-seven thousand, eight hundred thirty-seven".