247400789 has 2 divisors, whose sum is σ = 247400790. Its totient is φ = 247400788.

The previous prime is 247400771. The next prime is 247400819. The reversal of 247400789 is 987004742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178676689 + 68724100 = 13367^2 + 8290^2 .

It is a cyclic number.

It is not a de Polignac number, because 247400789 - 2¹² = 247396693 is a prime.

It is a super-2 number, since 2×247400789² = 122414300795645042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247400749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123700394 + 123700395.

It is an arithmetic number, because the mean of its divisors is an integer number (123700395).

Almost surely, 2^247400789 is an apocalyptic number.

It is an amenable number.

247400789 is a deficient number, since it is larger than the sum of its proper divisors (1).

247400789 is an equidigital number, since it uses as much as digits as its factorization.

247400789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 247400789 is about 15728.9792739389. The cubic root of 247400789 is about 627.7697143739.

The spelling of 247400789 in words is "two hundred forty-seven million, four hundred thousand, seven hundred eighty-nine".