247997943 has 10 divisors (see below), whose sum is σ = 370466184. Its totient is φ = 165331908.

The previous prime is 247997873. The next prime is 247997947. The reversal of 247997943 is 349799742.

It is a happy number.

It is not a de Polignac number, because 247997943 - 2¹³ = 247989751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 247997943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247997947) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1530771 + ... + 1530932.

Almost surely, 2^247997943 is an apocalyptic number.

247997943 is a deficient number, since it is larger than the sum of its proper divisors (122468241).

247997943 is an equidigital number, since it uses as much as digits as its factorization.

247997943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3061715 (or 3061706 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The square root of 247997943 is about 15747.9504380729. The cubic root of 247997943 is about 628.2743934251.

The spelling of 247997943 in words is "two hundred forty-seven million, nine hundred ninety-seven thousand, nine hundred forty-three".