247445 has 12 divisors (see below), whose sum is σ = 327180. Its totient is φ = 179520.

The previous prime is 247439. The next prime is 247451. The reversal of 247445 is 544742.

It is an interprime number because it is at equal distance from previous prime (247439) and next prime (247451).

It can be written as a sum of positive squares in 2 ways, for example, as 165649 + 81796 = 407^2 + 286^2 .

It is not a de Polignac number, because 247445 - 2⁶ = 247381 is a prime.

It is a super-2 number, since 2×247445² = 122458056050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 401 + ... + 809.

It is an arithmetic number, because the mean of its divisors is an integer number (27265).

2²⁴⁷⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

247445 is a deficient number, since it is larger than the sum of its proper divisors (79735).

247445 is a wasteful number, since it uses less digits than its factorization.

247445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 425 counting only the distinct ones).

The product of its digits is 4480, while the sum is 26.

The square root of 247445 is about 497.4384384022. The cubic root of 247445 is about 62.7807106701.

The spelling of 247445 in words is "two hundred forty-seven thousand, four hundred forty-five".