1921039 has 6 divisors (see below), whose sum is σ = 1986000. Its totient is φ = 1858140.

The previous prime is 1921037. The next prime is 1921063. The reversal of 1921039 is 9301291.

It is not a de Polignac number, because 1921039 - 2¹ = 1921037 is a prime.

It is a Duffinian number.

1921039 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921037) 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, 39 + ... + 1960.

It is an arithmetic number, because the mean of its divisors is an integer number (331000).

2^1921039 is an apocalyptic number.

1921039 is a deficient number, since it is larger than the sum of its proper divisors (64961).

1921039 is an equidigital number, since it uses as much as digits as its factorization.

1921039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061 (or 2030 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1921039 is about 1386.0155121787. The cubic root of 1921039 is about 124.3117157409.

The spelling of 1921039 in words is "one million, nine hundred twenty-one thousand, thirty-nine".