1399706078 has 16 divisors (see below), whose sum is σ = 2250059040. Its totient is φ = 651331296.

The previous prime is 1399706053. The next prime is 1399706081. The reversal of 1399706078 is 8706079931.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409493 + ... + 412896.

It is an arithmetic number, because the mean of its divisors is an integer number (140628690).

Almost surely, 2^1399706078 is an apocalyptic number.

1399706078 is a deficient number, since it is larger than the sum of its proper divisors (850352962).

1399706078 is a wasteful number, since it uses less digits than its factorization.

1399706078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822451.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 1399706078 is about 37412.6459636311. The cubic root of 1399706078 is about 1118.6106491518.

The spelling of 1399706078 in words is "one billion, three hundred ninety-nine million, seven hundred six thousand, seventy-eight".