1815420897 has 16 divisors (see below), whose sum is σ = 2690256000. Its totient is φ = 1209946032.

The previous prime is 1815420881. The next prime is 1815420899. The reversal of 1815420897 is 7980245181.

1815420897 is a `hidden beast` number, since 18 + 1 + 542 + 0 + 8 + 97 = 666.

It is not a de Polignac number, because 1815420897 - 2⁴ = 1815420881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1815420899) 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 15 ways as a sum of consecutive naturals, for example, 125979 + ... + 139647.

It is an arithmetic number, because the mean of its divisors is an integer number (168141000).

Almost surely, 2^1815420897 is an apocalyptic number.

It is an amenable number.

1815420897 is a deficient number, since it is larger than the sum of its proper divisors (874835103).

1815420897 is a wasteful number, since it uses less digits than its factorization.

1815420897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18597 (or 18591 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The square root of 1815420897 is about 42607.7563009366. The cubic root of 1815420897 is about 1219.9043410171.

The spelling of 1815420897 in words is "one billion, eight hundred fifteen million, four hundred twenty thousand, eight hundred ninety-seven".