1438250220 has 144 divisors (see below), whose sum is σ = 5009921280. Its totient is φ = 330307200.

The previous prime is 1438250189. The next prime is 1438250267. The reversal of 1438250220 is 220528341.

1438250220 is a `hidden beast` number, since 1 + 438 + 2 + 5 + 0 + 220 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18505 + ... + 56735.

It is an arithmetic number, because the mean of its divisors is an integer number (34791120).

Almost surely, 2^1438250220 is an apocalyptic number.

1438250220 is a gapful number since it is divisible by the number (10) 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 1438250220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2504960640).

1438250220 is an abundant number, since it is smaller than the sum of its proper divisors (3571671060).

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

1438250220 is a wasteful number, since it uses less digits than its factorization.

1438250220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38276 (or 38271 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1438250220 is about 37924.2695381203. The cubic root of 1438250220 is about 1128.7856587080.

Adding to 1438250220 its reverse (220528341), we get a palindrome (1658778561).

The spelling of 1438250220 in words is "one billion, four hundred thirty-eight million, two hundred fifty thousand, two hundred twenty".