397994297693 has 8 divisors (see below), whose sum is σ = 399624423000. Its totient is φ = 396367184448.

The previous prime is 397994297633. The next prime is 397994297711. The reversal of 397994297693 is 396792499793.

It can be written as a sum of positive squares in 4 ways, for example, as 12369443524 + 385624854169 = 111218^2 + 620987^2 .

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 397994297693 - 2¹² = 397994293597 is a prime.

It is a super-2 number, since 2×397994297693² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397994297633) 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, 488018 + ... + 1016931.

It is an arithmetic number, because the mean of its divisors is an integer number (49953052875).

Almost surely, 2^397994297693 is an apocalyptic number.

It is an amenable number.

397994297693 is a deficient number, since it is larger than the sum of its proper divisors (1630125307).

397994297693 is a wasteful number, since it uses less digits than its factorization.

397994297693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506031.

The product of its digits is 1249949232, while the sum is 77.

The spelling of 397994297693 in words is "three hundred ninety-seven billion, nine hundred ninety-four million, two hundred ninety-seven thousand, six hundred ninety-three".