1281430 has 16 divisors (see below), whose sum is σ = 2327040. Its totient is φ = 508032.

The previous prime is 1281407. The next prime is 1281431. The reversal of 1281430 is 341821.

It is a junction number, because it is equal to n+sod(n) for n = 1281398 and 1281407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 766 + ... + 1774.

It is an arithmetic number, because the mean of its divisors is an integer number (145440).

2^1281430 is an apocalyptic number.

1281430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1281430 is a deficient number, since it is larger than the sum of its proper divisors (1045610).

1281430 is a wasteful number, since it uses less digits than its factorization.

1281430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1281430 is about 1132.0026501736. The cubic root of 1281430 is about 108.6171231283.

It can be divided in two parts, 1281 and 430, that added together give a triangular number (1711 = T₅₈).

The spelling of 1281430 in words is "one million, two hundred eighty-one thousand, four hundred thirty".