1998210415 has 4 divisors (see below), whose sum is σ = 2397852504. Its totient is φ = 1598568328.

The previous prime is 1998210397. The next prime is 1998210421. The reversal of 1998210415 is 5140128991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5140128991 = 2381 ⋅2158811.

It is a cyclic number.

It is not a de Polignac number, because 1998210415 - 2¹¹ = 1998208367 is a prime.

It is a super-2 number, since 2×1998210415² = 7985689725228944450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199821037 + ... + 199821046.

It is an arithmetic number, because the mean of its divisors is an integer number (599463126).

Almost surely, 2^1998210415 is an apocalyptic number.

1998210415 is a deficient number, since it is larger than the sum of its proper divisors (399642089).

1998210415 is an equidigital number, since it uses as much as digits as its factorization.

1998210415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399642088.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1998210415 is about 44701.3469036449. The cubic root of 1998210415 is about 1259.5451484526.

The spelling of 1998210415 in words is "one billion, nine hundred ninety-eight million, two hundred ten thousand, four hundred fifteen".