1281894420 has 96 divisors (see below), whose sum is σ = 3765549312. Its totient is φ = 325214208.

The previous prime is 1281894407. The next prime is 1281894463. The reversal of 1281894420 is 244981821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263934 + ... + 268746.

It is an arithmetic number, because the mean of its divisors is an integer number (39224472).

Almost surely, 2^1281894420 is an apocalyptic number.

1281894420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281894420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1882774656).

1281894420 is an abundant number, since it is smaller than the sum of its proper divisors (2483654892).

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

1281894420 is a wasteful number, since it uses less digits than its factorization.

1281894420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5041 (or 5039 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 1281894420 is about 35803.5531756277. The cubic root of 1281894420 is about 1086.3024333293.

The spelling of 1281894420 in words is "one billion, two hundred eighty-one million, eight hundred ninety-four thousand, four hundred twenty".