247890 has 16 divisors (see below), whose sum is σ = 595008. Its totient is φ = 66096.

The previous prime is 247889. The next prime is 247901. The reversal of 247890 is 98742.

It is a super-2 number, since 2×247890² = 122898904200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 8263 = 247890 / (2 + 4 + 7 + 8 + 9 + 0).

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, 4102 + ... + 4161.

It is an arithmetic number, because the mean of its divisors is an integer number (37188).

2²⁴⁷⁸⁹⁰ is an apocalyptic number.

247890 is an abundant number, since it is smaller than the sum of its proper divisors (347118).

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

247890 is a wasteful number, since it uses less digits than its factorization.

247890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8273.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 247890 is about 497.8855290124. The cubic root of 247890 is about 62.8183226453.

The spelling of 247890 in words is "two hundred forty-seven thousand, eight hundred ninety".