1398840706 has 8 divisors (see below), whose sum is σ = 2149438284. Its totient is φ = 682361280.

The previous prime is 1398840661. The next prime is 1398840719. The reversal of 1398840706 is 6070488931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1279135225 + 119705481 = 35765^2 + 10941^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×1398840706³ (a number of 28 digits) contains 333 as substring.

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 3 ways as a sum of consecutive naturals, for example, 8529435 + ... + 8529598.

Almost surely, 2^1398840706 is an apocalyptic number.

1398840706 is a deficient number, since it is larger than the sum of its proper divisors (750597578).

1398840706 is a wasteful number, since it uses less digits than its factorization.

1398840706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17059076.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 1398840706 is about 37401.0789416562. The cubic root of 1398840706 is about 1118.3800736258.

The spelling of 1398840706 in words is "one billion, three hundred ninety-eight million, eight hundred forty thousand, seven hundred six".