247172840 has 16 divisors (see below), whose sum is σ = 556138980. Its totient is φ = 98869120.

The previous prime is 247172833. The next prime is 247172851. The reversal of 247172840 is 48271742.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 226141444 + 21031396 = 15038^2 + 4586^2 .

It is a super-2 number, since 2×247172840² = 122188825667331200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 247172840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3089621 + ... + 3089700.

Almost surely, 2^247172840 is an apocalyptic number.

247172840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247172840 is an abundant number, since it is smaller than the sum of its proper divisors (308966140).

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

247172840 is a wasteful number, since it uses less digits than its factorization.

247172840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6179332 (or 6179328 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 35.

The square root of 247172840 is about 15721.7314568084. The cubic root of 247172840 is about 627.5768512722.

The spelling of 247172840 in words is "two hundred forty-seven million, one hundred seventy-two thousand, eight hundred forty".