1283921 has 4 divisors (see below), whose sum is σ = 1303152. Its totient is φ = 1264692.

The previous prime is 1283903. The next prime is 1283939. The reversal of 1283921 is 1293821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1283903) and next prime (1283939).

It is not a de Polignac number, because 1283921 - 2¹⁸ = 1021777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1283941) 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, 9515 + ... + 9648.

It is an arithmetic number, because the mean of its divisors is an integer number (325788).

2^1283921 is an apocalyptic number.

It is an amenable number.

1283921 is a deficient number, since it is larger than the sum of its proper divisors (19231).

1283921 is an equidigital number, since it uses as much as digits as its factorization.

1283921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19230.

The product of its digits is 864, while the sum is 26.

The square root of 1283921 is about 1133.1023784284. The cubic root of 1283921 is about 108.6874586450.

The spelling of 1283921 in words is "one million, two hundred eighty-three thousand, nine hundred twenty-one".