247638449 has 2 divisors, whose sum is σ = 247638450. Its totient is φ = 247638448.

The previous prime is 247638431. The next prime is 247638463. The reversal of 247638449 is 944836742.

It is a happy number.

247638449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224790049 + 22848400 = 14993^2 + 4780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247638449 is a prime.

It is a super-2 number, since 2×247638449² = 122649602846251202, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (247638409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123819224 + 123819225.

It is an arithmetic number, because the mean of its divisors is an integer number (123819225).

Almost surely, 2^247638449 is an apocalyptic number.

It is an amenable number.

247638449 is a deficient number, since it is larger than the sum of its proper divisors (1).

247638449 is an equidigital number, since it uses as much as digits as its factorization.

247638449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 47.

The square root of 247638449 is about 15736.5323054350. The cubic root of 247638449 is about 627.9706676564.

The spelling of 247638449 in words is "two hundred forty-seven million, six hundred thirty-eight thousand, four hundred forty-nine".