1272428 has 6 divisors (see below), whose sum is σ = 2226756. Its totient is φ = 636212.

The previous prime is 1272421. The next prime is 1272443. The reversal of 1272428 is 8242721.

It is a junction number, because it is equal to n+sod(n) for n = 1272397 and 1272406.

It is not an unprimeable number, because it can be changed into a prime (1272421) 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 as a sum of consecutive naturals, namely, 159050 + ... + 159057.

It is an arithmetic number, because the mean of its divisors is an integer number (371126).

2^1272428 is an apocalyptic number.

It is an amenable number.

1272428 is a deficient number, since it is larger than the sum of its proper divisors (954328).

1272428 is a wasteful number, since it uses less digits than its factorization.

1272428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318111 (or 318109 counting only the distinct ones).

The product of its digits is 1792, while the sum is 26.

The square root of 1272428 is about 1128.0195033775. The cubic root of 1272428 is about 108.3621814035.

The spelling of 1272428 in words is "one million, two hundred seventy-two thousand, four hundred twenty-eight".