1399641121 has 4 divisors (see below), whose sum is σ = 1405497600. Its totient is φ = 1393784644.

The previous prime is 1399641109. The next prime is 1399641151. The reversal of 1399641121 is 1211469931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1399641121 - 2¹⁹ = 1399116833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1399641151) 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, 2927881 + ... + 2928358.

It is an arithmetic number, because the mean of its divisors is an integer number (351374400).

Almost surely, 2^1399641121 is an apocalyptic number.

It is an amenable number.

1399641121 is a deficient number, since it is larger than the sum of its proper divisors (5856479).

1399641121 is an equidigital number, since it uses as much as digits as its factorization.

1399641121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856478.

The product of its digits is 11664, while the sum is 37.

The square root of 1399641121 is about 37411.7778380018. Note that the first 3 decimals coincide. The cubic root of 1399641121 is about 1118.5933448722.

The spelling of 1399641121 in words is "one billion, three hundred ninety-nine million, six hundred forty-one thousand, one hundred twenty-one".