1284433921 has 3 divisors (see below), whose sum is σ = 1284469761. Its totient is φ = 1284398082.

The previous prime is 1284433901. The next prime is 1284433933. The reversal of 1284433921 is 1293344821.

The square root of 1284433921 is 35839.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1293344821 = 139 ⋅9304639.

It is not a de Polignac number, because 1284433921 - 2¹¹ = 1284431873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1284433901) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17920 + ... + 53758.

It is an arithmetic number, because the mean of its divisors is an integer number (428156587).

Almost surely, 2^1284433921 is an apocalyptic number.

1284433921 is the 35839-th square number.

1284433921 is the 17920-th centered octagonal number.

It is an amenable number.

1284433921 is a deficient number, since it is larger than the sum of its proper divisors (35840).

1284433921 is an frugal number, since it uses more digits than its factorization.

1284433921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71678 (or 35839 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The cubic root of 1284433921 is about 1087.0193011115.

The spelling of 1284433921 in words is "one billion, two hundred eighty-four million, four hundred thirty-three thousand, nine hundred twenty-one".