247907489 has 4 divisors (see below), whose sum is σ = 251303556. Its totient is φ = 244511424.

The previous prime is 247907483. The next prime is 247907519. The reversal of 247907489 is 984709742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984709742 = 2 ⋅492354871.

It can be written as a sum of positive squares in 2 ways, for example, as 104387089 + 143520400 = 10217^2 + 11980^2 .

It is a cyclic number.

It is not a de Polignac number, because 247907489 - 2¹⁶ = 247841953 is a prime.

It is a super-2 number, since 2×247907489² = 122916246204570242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247907483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1697924 + ... + 1698069.

It is an arithmetic number, because the mean of its divisors is an integer number (62825889).

Almost surely, 2^247907489 is an apocalyptic number.

It is an amenable number.

247907489 is a deficient number, since it is larger than the sum of its proper divisors (3396067).

247907489 is an equidigital number, since it uses as much as digits as its factorization.

247907489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3396066.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 247907489 is about 15745.0782468681. The cubic root of 247907489 is about 628.1979991857.

The spelling of 247907489 in words is "two hundred forty-seven million, nine hundred seven thousand, four hundred eighty-nine".