1378666042 has 16 divisors (see below), whose sum is σ = 2227690080. Its totient is φ = 636131952.

The previous prime is 1378666033. The next prime is 1378666067. The reversal of 1378666042 is 2406668731.

It is a self number, because there is not a number n which added to its sum of digits gives 1378666042.

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, 169153 + ... + 177115.

It is an arithmetic number, because the mean of its divisors is an integer number (139230630).

Almost surely, 2^1378666042 is an apocalyptic number.

1378666042 is a deficient number, since it is larger than the sum of its proper divisors (849024038).

1378666042 is a wasteful number, since it uses less digits than its factorization.

1378666042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14637.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 1378666042 is about 37130.3924299219. The cubic root of 1378666042 is about 1112.9774354756.

The spelling of 1378666042 in words is "one billion, three hundred seventy-eight million, six hundred sixty-six thousand, forty-two".