1399889 has 8 divisors (see below), whose sum is σ = 1453032. Its totient is φ = 1347840.

The previous prime is 1399883. The next prime is 1399913. The reversal of 1399889 is 9889931.

It can be written as a sum of positive squares in 4 ways, for example, as 400 + 1399489 = 20^2 + 1183^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1399889 - 2⁸ = 1399633 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1399883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3017 + ... + 3449.

It is an arithmetic number, because the mean of its divisors is an integer number (181629).

2^1399889 is an apocalyptic number.

It is an amenable number.

1399889 is a deficient number, since it is larger than the sum of its proper divisors (53143).

1399889 is an equidigital number, since it uses as much as digits as its factorization.

1399889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547.

The product of its digits is 139968, while the sum is 47.

The square root of 1399889 is about 1183.1690496290. The cubic root of 1399889 is about 111.8659375949.

The spelling of 1399889 in words is "one million, three hundred ninety-nine thousand, eight hundred eighty-nine".