1251728 has 10 divisors (see below), whose sum is σ = 2425254. Its totient is φ = 625856.

The previous prime is 1251721. The next prime is 1251743. The reversal of 1251728 is 8271521.

It can be written as a sum of positive squares in only one way, i.e., 692224 + 559504 = 832^2 + 748^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1251697 and 1251706.

It is not an unprimeable number, because it can be changed into a prime (1251721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39101 + ... + 39132.

2^1251728 is an apocalyptic number.

It is an amenable number.

1251728 is a deficient number, since it is larger than the sum of its proper divisors (1173526).

1251728 is an equidigital number, since it uses as much as digits as its factorization.

1251728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78241 (or 78235 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 1251728 is about 1118.8065069528. The cubic root of 1251728 is about 107.7713498211.

It can be divided in two parts, 125 and 1728, that multiplied together give a cube (216000 = 60³).

The spelling of 1251728 in words is "one million, two hundred fifty-one thousand, seven hundred twenty-eight".