247981863 has 16 divisors (see below), whose sum is σ = 349297280. Its totient is φ = 156056544.

The previous prime is 247981841. The next prime is 247981879. The reversal of 247981863 is 368189742.

It is not a de Polignac number, because 247981863 - 2⁹ = 247981351 is a prime.

It is a super-2 number, since 2×247981863² = 122990008753901538, which 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 (247981663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8445 + ... + 23817.

It is an arithmetic number, because the mean of its divisors is an integer number (21831080).

Almost surely, 2^247981863 is an apocalyptic number.

247981863 is a deficient number, since it is larger than the sum of its proper divisors (101315417).

247981863 is a wasteful number, since it uses less digits than its factorization.

247981863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15678.

The product of its digits is 580608, while the sum is 48.

The square root of 247981863 is about 15747.4398871690. The cubic root of 247981863 is about 628.2608141853.

The spelling of 247981863 in words is "two hundred forty-seven million, nine hundred eighty-one thousand, eight hundred sixty-three".