247397009 has 4 divisors (see below), whose sum is σ = 247428720. Its totient is φ = 247365300.

The previous prime is 247396997. The next prime is 247397027. The reversal of 247397009 is 900793742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 247397009 - 2⁸ = 247396753 is a prime.

It is a super-2 number, since 2×247397009² = 122410560124292162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247397509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4934 + ... + 22784.

It is an arithmetic number, because the mean of its divisors is an integer number (61857180).

Almost surely, 2^247397009 is an apocalyptic number.

It is an amenable number.

247397009 is a deficient number, since it is larger than the sum of its proper divisors (31711).

247397009 is a wasteful number, since it uses less digits than its factorization.

247397009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31710.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 247397009 is about 15728.8591131080. The cubic root of 247397009 is about 627.7665171575.

The spelling of 247397009 in words is "two hundred forty-seven million, three hundred ninety-seven thousand, nine".