1921240 has 32 divisors (see below), whose sum is σ = 4427280. Its totient is φ = 749952.

The previous prime is 1921229. The next prime is 1921247. The reversal of 1921240 is 421291.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921247) 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, 1162 + ... + 2278.

2^1921240 is an apocalyptic number.

1921240 is a gapful number since it is divisible by the number (10) 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 1921240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213640).

1921240 is an abundant number, since it is smaller than the sum of its proper divisors (2506040).

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

1921240 is a wasteful number, since it uses less digits than its factorization.

1921240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171 (or 1167 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1921240 is about 1386.0880202931. The cubic root of 1921240 is about 124.3160512044.

The spelling of 1921240 in words is "one million, nine hundred twenty-one thousand, two hundred forty".