1281420 has 120 divisors (see below), whose sum is σ = 4634784. Its totient is φ = 290304.

The previous prime is 1281407. The next prime is 1281431. The reversal of 1281420 is 241821.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1281393 and 1281402.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11284 + ... + 11396.

2^1281420 is an apocalyptic number.

1281420 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 1281420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2317392).

1281420 is an abundant number, since it is smaller than the sum of its proper divisors (3353364).

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

1281420 is a wasteful number, since it uses less digits than its factorization.

1281420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1281420 is about 1131.9982332142. The cubic root of 1281420 is about 108.6168405861.

The spelling of 1281420 in words is "one million, two hundred eighty-one thousand, four hundred twenty".