1398989 has 8 divisors (see below), whose sum is σ = 1524000. Its totient is φ = 1279152.

The previous prime is 1398979. The next prime is 1398997. The reversal of 1398989 is 9898931.

1398989 = T₁₉₀ + T₁₉₁ + ... + T₂₄₇.

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 1398989 - 2⁴ = 1398973 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 719 + ... + 1820.

It is an arithmetic number, because the mean of its divisors is an integer number (190500).

2^1398989 is an apocalyptic number.

1398989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1398989 is a deficient number, since it is larger than the sum of its proper divisors (125011).

1398989 is a wasteful number, since it uses less digits than its factorization.

1398989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587.

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

The square root of 1398989 is about 1182.7886539868. The cubic root of 1398989 is about 111.8419592825.

The spelling of 1398989 in words is "one million, three hundred ninety-eight thousand, nine hundred eighty-nine".