1399641 has 4 divisors (see below), whose sum is σ = 1866192. Its totient is φ = 933092.

The previous prime is 1399639. The next prime is 1399663. The reversal of 1399641 is 1469931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1469931 = 3 ⋅489977.

It is a cyclic number.

It is not a de Polignac number, because 1399641 - 2¹ = 1399639 is a prime.

It is a D-number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1399621) 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, 233271 + ... + 233276.

It is an arithmetic number, because the mean of its divisors is an integer number (466548).

2^1399641 is an apocalyptic number.

It is an amenable number.

1399641 is a deficient number, since it is larger than the sum of its proper divisors (466551).

1399641 is an equidigital number, since it uses as much as digits as its factorization.

1399641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466550.

The product of its digits is 5832, while the sum is 33.

The square root of 1399641 is about 1183.0642417046. The cubic root of 1399641 is about 111.8593312638.

The spelling of 1399641 in words is "one million, three hundred ninety-nine thousand, six hundred forty-one".