1438220 has 24 divisors (see below), whose sum is σ = 3452064. Its totient is φ = 493056.

The previous prime is 1438211. The next prime is 1438223. The reversal of 1438220 is 228341.

1438220 = T₂₆₉ + T₂₇₀ + ... + T₃₀₃.

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

It is a junction number, because it is equal to n+sod(n) for n = 1438192 and 1438201.

It is not an unprimeable number, because it can be changed into a prime (1438223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4997 + ... + 5276.

It is an arithmetic number, because the mean of its divisors is an integer number (143836).

2^1438220 is an apocalyptic number.

1438220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1438220 is an abundant number, since it is smaller than the sum of its proper divisors (2013844).

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

1438220 is a wasteful number, since it uses less digits than its factorization.

1438220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10289 (or 10287 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1438220 is about 1199.2581039960. The cubic root of 1438220 is about 112.8777752772.

The spelling of 1438220 in words is "one million, four hundred thirty-eight thousand, two hundred twenty".