1921438 has 8 divisors (see below), whose sum is σ = 2918880. Its totient is φ = 948480.

The previous prime is 1921427. The next prime is 1921457. The reversal of 1921438 is 8341291.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5923 + ... + 6238.

It is an arithmetic number, because the mean of its divisors is an integer number (364860).

2^1921438 is an apocalyptic number.

1921438 is a deficient number, since it is larger than the sum of its proper divisors (997442).

1921438 is a wasteful number, since it uses less digits than its factorization.

1921438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12242.

The product of its digits is 1728, while the sum is 28.

The square root of 1921438 is about 1386.1594424885. The cubic root of 1921438 is about 124.3203216639.

The spelling of 1921438 in words is "one million, nine hundred twenty-one thousand, four hundred thirty-eight".