1865820115 has 16 divisors (see below), whose sum is σ = 2278354176. Its totient is φ = 1466467200.

The previous prime is 1865820113. The next prime is 1865820133. The reversal of 1865820115 is 5110285681.

It is not a de Polignac number, because 1865820115 - 2¹ = 1865820113 is a prime.

It is a super-2 number, since 2×1865820115² = 6962569403077226450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1865820113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299169 + ... + 305341.

It is an arithmetic number, because the mean of its divisors is an integer number (142397136).

Almost surely, 2^1865820115 is an apocalyptic number.

1865820115 is a deficient number, since it is larger than the sum of its proper divisors (412534061).

1865820115 is an equidigital number, since it uses as much as digits as its factorization.

1865820115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7230.

The product of its (nonzero) digits is 19200, while the sum is 37.

The square root of 1865820115 is about 43195.1399465264. The cubic root of 1865820115 is about 1231.0903401586.

The spelling of 1865820115 in words is "one billion, eight hundred sixty-five million, eight hundred twenty thousand, one hundred fifteen".