1284684918 has 128 divisors (see below), whose sum is σ = 3049436160. Its totient is φ = 356843520.

The previous prime is 1284684853. The next prime is 1284684923. The reversal of 1284684918 is 8194864821.

1284684918 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4998646 + ... + 4998902.

It is an arithmetic number, because the mean of its divisors is an integer number (23823720).

Almost surely, 2^1284684918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1284684918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524718080).

1284684918 is an abundant number, since it is smaller than the sum of its proper divisors (1764751242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1284684918 is a wasteful number, since it uses less digits than its factorization.

1284684918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422.

The product of its digits is 884736, while the sum is 51.

The square root of 1284684918 is about 35842.5015589035. The cubic root of 1284684918 is about 1087.0901029407.

It can be divided in two parts, 128468 and 4918, that added together give a triangular number (133386 = T₅₁₆).

The spelling of 1284684918 in words is "one billion, two hundred eighty-four million, six hundred eighty-four thousand, nine hundred eighteen".