1220438 has 4 divisors (see below), whose sum is σ = 1830660. Its totient is φ = 610218.

The previous prime is 1220437. The next prime is 1220489. The reversal of 1220438 is 8340221.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305108 + ... + 305111.

It is an arithmetic number, because the mean of its divisors is an integer number (457665).

2^1220438 is an apocalyptic number.

1220438 is a deficient number, since it is larger than the sum of its proper divisors (610222).

1220438 is an equidigital number, since it uses as much as digits as its factorization.

1220438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610221.

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

The square root of 1220438 is about 1104.7343572099. The cubic root of 1220438 is about 106.8657588079.

Adding to 1220438 its reverse (8340221), we get a palindrome (9560659).

The spelling of 1220438 in words is "one million, two hundred twenty thousand, four hundred thirty-eight".