1921724 has 12 divisors (see below), whose sum is σ = 3843504. Its totient is φ = 823584.

The previous prime is 1921723. The next prime is 1921729. The reversal of 1921724 is 4271291.

1921724 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1921693 and 1921702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34289 + ... + 34344.

It is an arithmetic number, because the mean of its divisors is an integer number (320292).

2^1921724 is an apocalyptic number.

1921724 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1921724 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1921724 is a wasteful number, since it uses less digits than its factorization.

1921724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68644 (or 68642 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

The square root of 1921724 is about 1386.2626013855. The cubic root of 1921724 is about 124.3264895875.

The spelling of 1921724 in words is "one million, nine hundred twenty-one thousand, seven hundred twenty-four".