1438820 has 12 divisors (see below), whose sum is σ = 3021564. Its totient is φ = 575520.

The previous prime is 1438817. The next prime is 1438831. The reversal of 1438820 is 288341.

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 1069156 = 608^2 + 1034^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1438820.

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, 35951 + ... + 35990.

It is an arithmetic number, because the mean of its divisors is an integer number (251797).

2^1438820 is an apocalyptic number.

1438820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1438820 is an abundant number, since it is smaller than the sum of its proper divisors (1582744).

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

1438820 is a wasteful number, since it uses less digits than its factorization.

1438820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71950 (or 71948 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 1438820 is about 1199.5082325687. The cubic root of 1438820 is about 112.8934699668.

The spelling of 1438820 in words is "one million, four hundred thirty-eight thousand, eight hundred twenty".