1997824815 has 36 divisors (see below), whose sum is σ = 4028271624. Its totient is φ = 913290336.

The previous prime is 1997824813. The next prime is 1997824823. The reversal of 1997824815 is 5184287991.

It is a happy number.

1997824815 is a `hidden beast` number, since 1 + 99 + 78 + 2 + 481 + 5 = 666.

It is not a de Polignac number, because 1997824815 - 2¹ = 1997824813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997824813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 450817 + ... + 455226.

It is an arithmetic number, because the mean of its divisors is an integer number (111896434).

Almost surely, 2^1997824815 is an apocalyptic number.

1997824815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1997824815 is an abundant number, since it is smaller than the sum of its proper divisors (2030446809).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1997824815 is a wasteful number, since it uses less digits than its factorization.

1997824815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906068 (or 906058 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The square root of 1997824815 is about 44697.0336264052. The cubic root of 1997824815 is about 1259.4641239769.

The spelling of 1997824815 in words is "one billion, nine hundred ninety-seven million, eight hundred twenty-four thousand, eight hundred fifteen".