1378985426 has 16 divisors (see below), whose sum is σ = 2545819584. Its totient is φ = 545532624.

The previous prime is 1378985407. The next prime is 1378985437. The reversal of 1378985426 is 6245898731.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3788240 + ... + 3788603.

It is an arithmetic number, because the mean of its divisors is an integer number (159113724).

Almost surely, 2^1378985426 is an apocalyptic number.

1378985426 is a deficient number, since it is larger than the sum of its proper divisors (1166834158).

1378985426 is a wasteful number, since it uses less digits than its factorization.

1378985426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7576865.

The product of its digits is 2903040, while the sum is 53.

The square root of 1378985426 is about 37134.6930241789. The cubic root of 1378985426 is about 1113.0633735560.

The spelling of 1378985426 in words is "one billion, three hundred seventy-eight million, nine hundred eighty-five thousand, four hundred twenty-six".