1281428 has 12 divisors (see below), whose sum is σ = 2250612. Its totient is φ = 638400.

The previous prime is 1281407. The next prime is 1281431. The reversal of 1281428 is 8241821.

It can be written as a sum of positive squares in 2 ways, for example, as 1106704 + 174724 = 1052^2 + 418^2 .

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1281397 and 1281406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1478 + ... + 2178.

It is an arithmetic number, because the mean of its divisors is an integer number (187551).

2^1281428 is an apocalyptic number.

It is an amenable number.

1281428 is a deficient number, since it is larger than the sum of its proper divisors (969184).

1281428 is a wasteful number, since it uses less digits than its factorization.

1281428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162 (or 1160 counting only the distinct ones).

The product of its digits is 1024, while the sum is 26.

The square root of 1281428 is about 1132.0017667831. The cubic root of 1281428 is about 108.6170666200.

The spelling of 1281428 in words is "one million, two hundred eighty-one thousand, four hundred twenty-eight".