820988419 has 4 divisors (see below), whose sum is σ = 821371896. Its totient is φ = 820604944.

The previous prime is 820988417. The next prime is 820988437. The reversal of 820988419 is 914889028.

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

It is a cyclic number.

It is not a de Polignac number, because 820988419 - 2¹ = 820988417 is a prime.

It is a super-2 number, since 2×820988419² = 1348043968264239122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820988411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188509 + ... + 192814.

It is an arithmetic number, because the mean of its divisors is an integer number (205342974).

Almost surely, 2^820988419 is an apocalyptic number.

820988419 is a deficient number, since it is larger than the sum of its proper divisors (383477).

820988419 is a wasteful number, since it uses less digits than its factorization.

820988419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383476.

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 820988419 is about 28652.8954732327. The cubic root of 820988419 is about 936.3660887316.

The spelling of 820988419 in words is "eight hundred twenty million, nine hundred eighty-eight thousand, four hundred nineteen".