247009642 has 16 divisors (see below), whose sum is σ = 407542464. Its totient is φ = 112275900.

The previous prime is 247009619. The next prime is 247009703. The reversal of 247009642 is 246900742.

247009642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×247009642² = 122027526481936328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247009598 and 247009607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43734 + ... + 49057.

It is an arithmetic number, because the mean of its divisors is an integer number (25471404).

Almost surely, 2^247009642 is an apocalyptic number.

247009642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

247009642 is a deficient number, since it is larger than the sum of its proper divisors (160532822).

247009642 is an equidigital number, since it uses as much as digits as its factorization.

247009642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92826 (or 92804 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 247009642 is about 15716.5403953924. The cubic root of 247009642 is about 627.4386998525.

Subtracting from 247009642 its reverse (246900742), we obtain a square (108900 = 330²).

The spelling of 247009642 in words is "two hundred forty-seven million, nine thousand, six hundred forty-two".