245490 has 48 divisors (see below), whose sum is σ = 689472. Its totient is φ = 55776.

The previous prime is 245477. The next prime is 245501. The reversal of 245490 is 94542.

It is a self number, because there is not a number n which added to its sum of digits gives 245490.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1387 + ... + 1553.

It is an arithmetic number, because the mean of its divisors is an integer number (14364).

2²⁴⁵⁴⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 245490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (344736).

245490 is an abundant number, since it is smaller than the sum of its proper divisors (443982).

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

245490 is a wasteful number, since it uses less digits than its factorization.

245490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 245490 is about 495.4694743372. The cubic root of 245490 is about 62.6149351756.

The spelling of 245490 in words is "two hundred forty-five thousand, four hundred ninety".