247398857 has 2 divisors, whose sum is σ = 247398858. Its totient is φ = 247398856.

The previous prime is 247398803. The next prime is 247398911. The reversal of 247398857 is 758893742.

It is a balanced prime because it is at equal distance from previous prime (247398803) and next prime (247398911).

It can be written as a sum of positive squares in only one way, i.e., 223084096 + 24314761 = 14936^2 + 4931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247398857 is a prime.

It is a super-2 number, since 2×247398857² = 122412388889812898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247398799 and 247398808.

It is not a weakly prime, because it can be changed into another prime (247398257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123699428 + 123699429.

It is an arithmetic number, because the mean of its divisors is an integer number (123699429).

Almost surely, 2^247398857 is an apocalyptic number.

It is an amenable number.

247398857 is a deficient number, since it is larger than the sum of its proper divisors (1).

247398857 is an equidigital number, since it uses as much as digits as its factorization.

247398857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 53.

The square root of 247398857 is about 15728.9178585178. The cubic root of 247398857 is about 627.7680802451.

The spelling of 247398857 in words is "two hundred forty-seven million, three hundred ninety-eight thousand, eight hundred fifty-seven".