1284649923 has 4 divisors (see below), whose sum is σ = 1712866568. Its totient is φ = 856433280.

The previous prime is 1284649921. The next prime is 1284649939. The reversal of 1284649923 is 3299464821.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1284649923 - 2¹ = 1284649921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1284649921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214108318 + ... + 214108323.

It is an arithmetic number, because the mean of its divisors is an integer number (428216642).

Almost surely, 2^1284649923 is an apocalyptic number.

1284649923 is a deficient number, since it is larger than the sum of its proper divisors (428216645).

1284649923 is an equidigital number, since it uses as much as digits as its factorization.

1284649923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428216644.

The product of its digits is 746496, while the sum is 48.

The square root of 1284649923 is about 35842.0133781572. The cubic root of 1284649923 is about 1087.0802320214.

The spelling of 1284649923 in words is "one billion, two hundred eighty-four million, six hundred forty-nine thousand, nine hundred twenty-three".