245220140 has 48 divisors (see below), whose sum is σ = 569509920. Its totient is φ = 87943680.

The previous prime is 245220133. The next prime is 245220149. The reversal of 245220140 is 41022542.

It is a happy number.

245220140 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (245220149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8426 + ... + 23694.

It is an arithmetic number, because the mean of its divisors is an integer number (11864790).

Almost surely, 2^245220140 is an apocalyptic number.

245220140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 245220140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284754960).

245220140 is an abundant number, since it is smaller than the sum of its proper divisors (324289780).

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

245220140 is a wasteful number, since it uses less digits than its factorization.

245220140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15362 (or 15360 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 245220140 is about 15659.5063779163. The cubic root of 245220140 is about 625.9198317246.

Adding to 245220140 its reverse (41022542), we get a palindrome (286242682).

The spelling of 245220140 in words is "two hundred forty-five million, two hundred twenty thousand, one hundred forty".