1998615 has 8 divisors (see below), whose sum is σ = 3197808. Its totient is φ = 1065920.

The previous prime is 1998611. The next prime is 1998617. The reversal of 1998615 is 5168991.

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

It is not a de Polignac number, because 1998615 - 2² = 1998611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998611) 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, 66606 + ... + 66635.

It is an arithmetic number, because the mean of its divisors is an integer number (399726).

2^1998615 is an apocalyptic number.

1998615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1998615 is a deficient number, since it is larger than the sum of its proper divisors (1199193).

1998615 is a wasteful number, since it uses less digits than its factorization.

1998615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133249.

The product of its digits is 19440, while the sum is 39.

The square root of 1998615 is about 1413.7238061234. The cubic root of 1998615 is about 125.9630150960.

The spelling of 1998615 in words is "one million, nine hundred ninety-eight thousand, six hundred fifteen".