1219904 has 42 divisors (see below), whose sum is σ = 2823210. Its totient is φ = 521472.

The previous prime is 1219891. The next prime is 1219909. The reversal of 1219904 is 4099121.

It can be written as a sum of positive squares in only one way, i.e., 906304 + 313600 = 952^2 + 560^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2942 + ... + 3330.

2^1219904 is an apocalyptic number.

1219904 is a gapful number since it is divisible by the number (14) 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 1219904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1411605).

1219904 is an abundant number, since it is smaller than the sum of its proper divisors (1603306).

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

1219904 is an equidigital number, since it uses as much as digits as its factorization.

1219904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1219904 is about 1104.4926437057. The cubic root of 1219904 is about 106.8501702404.

The spelling of 1219904 in words is "one million, two hundred nineteen thousand, nine hundred four".