247903540 has 12 divisors (see below), whose sum is σ = 520597476. Its totient is φ = 99161408.

The previous prime is 247903511. The next prime is 247903543. The reversal of 247903540 is 45309742.

It can be written as a sum of positive squares in 2 ways, for example, as 37015056 + 210888484 = 6084^2 + 14522^2 .

It is a super-2 number, since 2×247903540² = 122912330289063200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247903496 and 247903505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247903543) 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, 6197569 + ... + 6197608.

It is an arithmetic number, because the mean of its divisors is an integer number (43383123).

Almost surely, 2^247903540 is an apocalyptic number.

247903540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247903540 is an abundant number, since it is smaller than the sum of its proper divisors (272693936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247903540 is a wasteful number, since it uses less digits than its factorization.

247903540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12395186 (or 12395184 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 247903540 is about 15744.9528421015. The cubic root of 247903540 is about 628.1946635770.

The spelling of 247903540 in words is "two hundred forty-seven million, nine hundred three thousand, five hundred forty".