1378427556 has 48 divisors (see below), whose sum is σ = 3512678400. Its totient is φ = 417234720.

The previous prime is 1378427543. The next prime is 1378427569. The reversal of 1378427556 is 6557248731.

It is an interprime number because it is at equal distance from previous prime (1378427543) and next prime (1378427569).

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 122245 + ... + 133043.

It is an arithmetic number, because the mean of its divisors is an integer number (73180800).

Almost surely, 2^1378427556 is an apocalyptic number.

It is an amenable number.

1378427556 is an abundant number, since it is smaller than the sum of its proper divisors (2134250844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1378427556 is a wasteful number, since it uses less digits than its factorization.

1378427556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11784 (or 11782 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 48.

The square root of 1378427556 is about 37127.1808248351. The cubic root of 1378427556 is about 1112.9132563258.

The spelling of 1378427556 in words is "one billion, three hundred seventy-eight million, four hundred twenty-seven thousand, five hundred fifty-six".