1284994821 has 16 divisors (see below), whose sum is σ = 1887594048. Its totient is φ = 771072000.

The previous prime is 1284994769. The next prime is 1284994831.

1284994821 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1284994821 - 2⁹ = 1284994309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284994831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189436 + ... + 196101.

It is an arithmetic number, because the mean of its divisors is an integer number (117974628).

Almost surely, 2^1284994821 is an apocalyptic number.

1284994821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1284994821 is a deficient number, since it is larger than the sum of its proper divisors (602599227).

1284994821 is a wasteful number, since it uses less digits than its factorization.

1284994821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385652.

The product of its digits is 331776, while the sum is 48.

The square root of 1284994821 is about 35846.8244200236. The cubic root of 1284994821 is about 1087.1775083929.

The spelling of 1284994821 in words is "one billion, two hundred eighty-four million, nine hundred ninety-four thousand, eight hundred twenty-one".