1021939 has 4 divisors (see below), whose sum is σ = 1039320. Its totient is φ = 1004560.

The previous prime is 1021919. The next prime is 1021961. The reversal of 1021939 is 9391201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9391201 = 83 ⋅113147.

It is a cyclic number.

It is not a de Polignac number, because 1021939 - 2⁵ = 1021907 is a prime.

It is a Duffinian number.

1021939 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1021919) 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, 8602 + ... + 8719.

It is an arithmetic number, because the mean of its divisors is an integer number (259830).

2^1021939 is an apocalyptic number.

1021939 is a deficient number, since it is larger than the sum of its proper divisors (17381).

1021939 is an equidigital number, since it uses as much as digits as its factorization.

1021939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17380.

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

The square root of 1021939 is about 1010.9099861016. The cubic root of 1021939 is about 100.7260162480.

The spelling of 1021939 in words is "one million, twenty-one thousand, nine hundred thirty-nine".