247990333 has 4 divisors (see below), whose sum is σ = 248543100. Its totient is φ = 247437568.

The previous prime is 247990321. The next prime is 247990349. The reversal of 247990333 is 333099742.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187197124 + 60793209 = 13682^2 + 7797^2 .

It is a cyclic number.

It is not a de Polignac number, because 247990333 - 2²¹ = 245893181 is a prime.

It is a super-2 number, since 2×247990333² = 122998410522901778, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247990733) 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, 275710 + ... + 276607.

It is an arithmetic number, because the mean of its divisors is an integer number (62135775).

Almost surely, 2^247990333 is an apocalyptic number.

It is an amenable number.

247990333 is a deficient number, since it is larger than the sum of its proper divisors (552767).

247990333 is an equidigital number, since it uses as much as digits as its factorization.

247990333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552766.

The product of its (nonzero) digits is 122472, while the sum is 40.

The square root of 247990333 is about 15747.7088174756. The cubic root of 247990333 is about 628.2679670048.

The spelling of 247990333 in words is "two hundred forty-seven million, nine hundred ninety thousand, three hundred thirty-three".