1922921 has 32 divisors (see below), whose sum is σ = 2757888. Its totient is φ = 1290240.

The previous prime is 1922909. The next prime is 1922923. The reversal of 1922921 is 1292291.

It is a happy number.

It is not a de Polignac number, because 1922921 - 2¹⁴ = 1906537 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1922923) 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 31 ways as a sum of consecutive naturals, for example, 16961 + ... + 17073.

It is an arithmetic number, because the mean of its divisors is an integer number (86184).

2^1922921 is an apocalyptic number.

1922921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1922921 is a deficient number, since it is larger than the sum of its proper divisors (834967).

1922921 is a wasteful number, since it uses less digits than its factorization.

1922921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161.

The product of its digits is 648, while the sum is 26.

The square root of 1922921 is about 1386.6942705586. The cubic root of 1922921 is about 124.3522976501.

It can be divided in two parts, 192 and 2921, that added together give a palindrome (3113).

The spelling of 1922921 in words is "one million, nine hundred twenty-two thousand, nine hundred twenty-one".