1930921 has 4 divisors (see below), whose sum is σ = 1934532. Its totient is φ = 1927312.

The previous prime is 1930883. The next prime is 1930927. The reversal of 1930921 is 1290391.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 403225 + 1527696 = 635^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 1930921 - 2⁷ = 1930793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1930927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826 + ... + 2131.

It is an arithmetic number, because the mean of its divisors is an integer number (483633).

2^1930921 is an apocalyptic number.

It is an amenable number.

1930921 is a deficient number, since it is larger than the sum of its proper divisors (3611).

1930921 is an equidigital number, since it uses as much as digits as its factorization.

1930921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610.

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

The square root of 1930921 is about 1389.5758345625. The cubic root of 1930921 is about 124.5245082207.

The spelling of 1930921 in words is "one million, nine hundred thirty thousand, nine hundred twenty-one".