1998415 has 8 divisors (see below), whose sum is σ = 2475648. Its totient is φ = 1547040.

The previous prime is 1998413. The next prime is 1998427. The reversal of 1998415 is 5148991.

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

It is not a de Polignac number, because 1998415 - 2¹ = 1998413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998413) 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, 6292 + ... + 6601.

It is an arithmetic number, because the mean of its divisors is an integer number (309456).

2^1998415 is an apocalyptic number.

1998415 is a deficient number, since it is larger than the sum of its proper divisors (477233).

1998415 is a wasteful number, since it uses less digits than its factorization.

1998415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12929.

The product of its digits is 12960, while the sum is 37.

The square root of 1998415 is about 1413.6530691793. The cubic root of 1998415 is about 125.9588132790.

The spelling of 1998415 in words is "one million, nine hundred ninety-eight thousand, four hundred fifteen".