1389998 has 4 divisors (see below), whose sum is σ = 2085000. Its totient is φ = 694998.

The previous prime is 1389991. The next prime is 1390003. The reversal of 1389998 is 8999831.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347498 + ... + 347501.

It is an arithmetic number, because the mean of its divisors is an integer number (521250).

2^1389998 is an apocalyptic number.

1389998 is a deficient number, since it is larger than the sum of its proper divisors (695002).

1389998 is an equidigital number, since it uses as much as digits as its factorization.

1389998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695001.

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

The square root of 1389998 is about 1178.9817640659. The cubic root of 1389998 is about 111.6018494660.

The spelling of 1389998 in words is "one million, three hundred eighty-nine thousand, nine hundred ninety-eight".