1399989 has 8 divisors (see below), whose sum is σ = 1906560. Its totient is φ = 913376.

The previous prime is 1399963. The next prime is 1399999. The reversal of 1399989 is 9899931.

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 1399989 - 2⁷ = 1399861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399919) 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, 4824 + ... + 5105.

It is an arithmetic number, because the mean of its divisors is an integer number (238320).

2^1399989 is an apocalyptic number.

It is an amenable number.

1399989 is a deficient number, since it is larger than the sum of its proper divisors (506571).

1399989 is an equidigital number, since it uses as much as digits as its factorization.

1399989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9979.

The product of its digits is 157464, while the sum is 48.

The square root of 1399989 is about 1183.2113082624. The cubic root of 1399989 is about 111.8686012174.

The spelling of 1399989 in words is "one million, three hundred ninety-nine thousand, nine hundred eighty-nine".