1966921 has 8 divisors (see below), whose sum is σ = 2160864. Its totient is φ = 1775520.

The previous prime is 1966907. The next prime is 1966931. The reversal of 1966921 is 1296691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1966921 - 2⁵ = 1966889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1245 + ... + 2341.

It is an arithmetic number, because the mean of its divisors is an integer number (270108).

2^1966921 is an apocalyptic number.

1966921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1966921 is a deficient number, since it is larger than the sum of its proper divisors (193943).

1966921 is a wasteful number, since it uses less digits than its factorization.

1966921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271.

The product of its digits is 5832, while the sum is 34.

The square root of 1966921 is about 1402.4696075138. The cubic root of 1966921 is about 125.2936244043.

It can be divided in two parts, 196 and 6921, that added together give a palindrome (7117).

The spelling of 1966921 in words is "one million, nine hundred sixty-six thousand, nine hundred twenty-one".