1378399286 has 16 divisors (see below), whose sum is σ = 2286463248. Its totient is φ = 617961600.

The previous prime is 1378399247. The next prime is 1378399301. The reversal of 1378399286 is 6829938731.

1378399286 = 2399² + 2400² + ... + 2617².

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427535 + ... + 430746.

It is an arithmetic number, because the mean of its divisors is an integer number (142903953).

Almost surely, 2^1378399286 is an apocalyptic number.

1378399286 is a deficient number, since it is larger than the sum of its proper divisors (908063962).

1378399286 is a wasteful number, since it uses less digits than its factorization.

1378399286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858367.

The product of its digits is 3919104, while the sum is 56.

The square root of 1378399286 is about 37126.8001045067. The cubic root of 1378399286 is about 1112.9056480738.

The spelling of 1378399286 in words is "one billion, three hundred seventy-eight million, three hundred ninety-nine thousand, two hundred eighty-six".