1973921 has 4 divisors (see below), whose sum is σ = 2090052. Its totient is φ = 1857792.

The previous prime is 1973911. The next prime is 1973927. The reversal of 1973921 is 1293791.

It is a happy number.

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 1234321 + 739600 = 1111^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1973921 - 2⁶ = 1973857 is a prime.

It is a super-2 number, since 2×1973921² = 7792728228482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1973927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58040 + ... + 58073.

It is an arithmetic number, because the mean of its divisors is an integer number (522513).

2^1973921 is an apocalyptic number.

It is an amenable number.

1973921 is a deficient number, since it is larger than the sum of its proper divisors (116131).

1973921 is a wasteful number, since it uses less digits than its factorization.

1973921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116130.

The product of its digits is 3402, while the sum is 32.

The square root of 1973921 is about 1404.9629888364. The cubic root of 1973921 is about 125.4420826602.

The spelling of 1973921 in words is "one million, nine hundred seventy-three thousand, nine hundred twenty-one".