1278556 has 6 divisors (see below), whose sum is σ = 2237480. Its totient is φ = 639276.

The previous prime is 1278551. The next prime is 1278583. The reversal of 1278556 is 6558721.

It is a super-3 number, since 3×1278556³ = 6270187365333910848, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159816 + ... + 159823.

2^1278556 is an apocalyptic number.

It is an amenable number.

1278556 is a deficient number, since it is larger than the sum of its proper divisors (958924).

1278556 is a wasteful number, since it uses less digits than its factorization.

1278556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319643 (or 319641 counting only the distinct ones).

The product of its digits is 16800, while the sum is 34.

The square root of 1278556 is about 1130.7325059447. The cubic root of 1278556 is about 108.5358599356.

The spelling of 1278556 in words is "one million, two hundred seventy-eight thousand, five hundred fifty-six".