245540 has 12 divisors (see below), whose sum is σ = 515676. Its totient is φ = 98208.

The previous prime is 245533. The next prime is 245561. The reversal of 245540 is 45542.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50176 + 195364 = 224^2 + 442^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 12277 = 245540 / (2 + 4 + 5 + 5 + 4 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6119 + ... + 6158.

It is an arithmetic number, because the mean of its divisors is an integer number (42973).

2²⁴⁵⁵⁴⁰ is an apocalyptic number.

245540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245540 is an abundant number, since it is smaller than the sum of its proper divisors (270136).

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

245540 is a wasteful number, since it uses less digits than its factorization.

245540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12286 (or 12284 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 245540 is about 495.5199289635. The cubic root of 245540 is about 62.6191859044.

The spelling of 245540 in words is "two hundred forty-five thousand, five hundred forty".