6723998397 has 6 divisors (see below), whose sum is σ = 9712442142. Its totient is φ = 4482665592.

The previous prime is 6723998383. The next prime is 6723998429. The reversal of 6723998397 is 7938993276.

6723998397 is a `hidden beast` number, since 6 + 7 + 239 + 9 + 8 + 397 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6550312356 + 173686041 = 80934^2 + 13179^2 .

It is not a de Polignac number, because 6723998397 - 2⁴ = 6723998381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6723998317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 373555458 + ... + 373555475.

It is an arithmetic number, because the mean of its divisors is an integer number (1618740357).

Almost surely, 2^6723998397 is an apocalyptic number.

It is an amenable number.

6723998397 is a deficient number, since it is larger than the sum of its proper divisors (2988443745).

6723998397 is a wasteful number, since it uses less digits than its factorization.

6723998397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747110939 (or 747110936 counting only the distinct ones).

The product of its digits is 30862944, while the sum is 63.

The square root of 6723998397 is about 81999.9902256092. The cubic root of 6723998397 is about 1887.4517880292.

The spelling of 6723998397 in words is "six billion, seven hundred twenty-three million, nine hundred ninety-eight thousand, three hundred ninety-seven".