1256430 has 64 divisors (see below), whose sum is σ = 3575808. Its totient is φ = 276480.

The previous prime is 1256429. The next prime is 1256449. The reversal of 1256430 is 346521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1256397 and 1256406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6414 + ... + 6606.

It is an arithmetic number, because the mean of its divisors is an integer number (55872).

2^1256430 is an apocalyptic number.

1256430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1787904).

1256430 is an abundant number, since it is smaller than the sum of its proper divisors (2319378).

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

1256430 is a wasteful number, since it uses less digits than its factorization.

1256430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1256430 is about 1120.9058836495. The cubic root of 1256430 is about 107.9061255603.

Subtracting from 1256430 its reverse (346521), we obtain a palindrome (909909).

It can be divided in two parts, 125 and 6430, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 1256430 in words is "one million, two hundred fifty-six thousand, four hundred thirty".