1399859161 has 4 divisors (see below), whose sum is σ = 1426271652. Its totient is φ = 1373446672.

The previous prime is 1399859137. The next prime is 1399859173. The reversal of 1399859161 is 1619589931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 833419161 + 566440000 = 28869^2 + 23800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399859161 - 2⁵ = 1399859129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1399859099 and 1399859108.

It is not an unprimeable number, because it can be changed into a prime (1399859191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13206166 + ... + 13206271.

It is an arithmetic number, because the mean of its divisors is an integer number (356567913).

Almost surely, 2^1399859161 is an apocalyptic number.

It is an amenable number.

1399859161 is a deficient number, since it is larger than the sum of its proper divisors (26412491).

1399859161 is an equidigital number, since it uses as much as digits as its factorization.

1399859161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26412490.

The product of its digits is 524880, while the sum is 52.

The square root of 1399859161 is about 37414.6917801016. The cubic root of 1399859161 is about 1118.6514277206.

The spelling of 1399859161 in words is "one billion, three hundred ninety-nine million, eight hundred fifty-nine thousand, one hundred sixty-one".