247499649 has 12 divisors (see below), whose sum is σ = 357996756. Its totient is φ = 164770272.

The previous prime is 247499639. The next prime is 247499663. The reversal of 247499649 is 946994742.

It can be written as a sum of positive squares in 2 ways, for example, as 197543025 + 49956624 = 14055^2 + 7068^2 .

It is not a de Polignac number, because 247499649 - 2⁴ = 247499633 is a prime.

It is a super-2 number, since 2×247499649² = 122512152510246402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247499595 and 247499604.

It is not an unprimeable number, because it can be changed into a prime (247499639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12162 + ... + 25355.

It is an arithmetic number, because the mean of its divisors is an integer number (29833063).

Almost surely, 2^247499649 is an apocalyptic number.

It is an amenable number.

247499649 is a deficient number, since it is larger than the sum of its proper divisors (110497107).

247499649 is a wasteful number, since it uses less digits than its factorization.

247499649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38256 (or 38253 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 247499649 is about 15732.1215670360. The cubic root of 247499649 is about 627.8533210183.

The spelling of 247499649 in words is "two hundred forty-seven million, four hundred ninety-nine thousand, six hundred forty-nine".