1399945698 has 18 divisors (see below), whose sum is σ = 3033559659. Its totient is φ = 466595652.

The previous prime is 1399945693. The next prime is 1399945717. The reversal of 1399945698 is 8965499931.

1399945698 is a `hidden beast` number, since 1 + 3 + 9 + 99 + 456 + 98 = 666.

It can be written as a sum of positive squares in only one way, i.e., 699972849 + 699972849 = 26457^2 + 26457^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=26457.

It is not an unprimeable number, because it can be changed into a prime (1399945693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 154333 + ... + 163151.

Almost surely, 2^1399945698 is an apocalyptic number.

1399945698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1399945698 is an abundant number, since it is smaller than the sum of its proper divisors (1633613961).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1399945698 is an frugal number, since it uses more digits than its factorization.

1399945698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17646 (or 8824 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 63.

The square root of 1399945698 is about 37415.8482197050. The cubic root of 1399945698 is about 1118.6744783118.

The spelling of 1399945698 in words is "one billion, three hundred ninety-nine million, nine hundred forty-five thousand, six hundred ninety-eight".