1256428 has 6 divisors (see below), whose sum is σ = 2198756. Its totient is φ = 628212.

The previous prime is 1256407. The next prime is 1256429. The reversal of 1256428 is 8246521.

It is a super-2 number, since 2×1256428² = 3157222638368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1256396 and 1256405.

It is not an unprimeable number, because it can be changed into a prime (1256429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157050 + ... + 157057.

2^1256428 is an apocalyptic number.

It is an amenable number.

1256428 is a deficient number, since it is larger than the sum of its proper divisors (942328).

1256428 is a wasteful number, since it uses less digits than its factorization.

1256428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314111 (or 314109 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 1256428 is about 1120.9049915136. The cubic root of 1256428 is about 107.9060683049.

The spelling of 1256428 in words is "one million, two hundred fifty-six thousand, four hundred twenty-eight".