1921107 has 4 divisors (see below), whose sum is σ = 2561480. Its totient is φ = 1280736.

The previous prime is 1921103. The next prime is 1921123. The reversal of 1921107 is 7011291.

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

It is not a de Polignac number, because 1921107 - 2² = 1921103 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921103) 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, 320182 + ... + 320187.

It is an arithmetic number, because the mean of its divisors is an integer number (640370).

2^1921107 is an apocalyptic number.

1921107 is a deficient number, since it is larger than the sum of its proper divisors (640373).

1921107 is an equidigital number, since it uses as much as digits as its factorization.

1921107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640372.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 1921107 is about 1386.0400427116. The cubic root of 1921107 is about 124.3131824988.

Adding to 1921107 its reverse (7011291), we get a palindrome (8932398).

The spelling of 1921107 in words is "one million, nine hundred twenty-one thousand, one hundred seven".