1263428 has 6 divisors (see below), whose sum is σ = 2211006. Its totient is φ = 631712.

The previous prime is 1263403. The next prime is 1263461. The reversal of 1263428 is 8243621.

It can be written as a sum of positive squares in only one way, i.e., 1149184 + 114244 = 1072^2 + 338^2 .

It is a super-2 number, since 2×1263428² = 3192500622368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1263397 and 1263406.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157925 + ... + 157932.

It is an arithmetic number, because the mean of its divisors is an integer number (368501).

2^1263428 is an apocalyptic number.

It is an amenable number.

1263428 is a deficient number, since it is larger than the sum of its proper divisors (947578).

1263428 is a wasteful number, since it uses less digits than its factorization.

1263428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315861 (or 315859 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 1263428 is about 1124.0231314346. The cubic root of 1263428 is about 108.1060914511.

The spelling of 1263428 in words is "one million, two hundred sixty-three thousand, four hundred twenty-eight".