247990 has 8 divisors (see below), whose sum is σ = 446400. Its totient is φ = 99192.

The previous prime is 247957. The next prime is 247991. The reversal of 247990 is 99742.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×247990² = 122998080200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247991) by changing a digit.

247990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12390 + ... + 12409.

It is an arithmetic number, because the mean of its divisors is an integer number (55800).

2²⁴⁷⁹⁹⁰ is an apocalyptic number.

247990 is a deficient number, since it is larger than the sum of its proper divisors (198410).

247990 is a wasteful number, since it uses less digits than its factorization.

247990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24806.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 247990 is about 497.9859435767. The cubic root of 247990 is about 62.8267685793.

The spelling of 247990 in words is "two hundred forty-seven thousand, nine hundred ninety".