1855920913 has 48 divisors (see below), whose sum is σ = 2446771968. Its totient is φ = 1391040000.

The previous prime is 1855920887. The next prime is 1855920943. The reversal of 1855920913 is 3190295581.

It is a happy number.

It is not a de Polignac number, because 1855920913 - 2⁵ = 1855920881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1855920913.

It is not an unprimeable number, because it can be changed into a prime (1855920943) 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 47 ways as a sum of consecutive naturals, for example, 1544713 + ... + 1545913.

It is an arithmetic number, because the mean of its divisors is an integer number (50974416).

Almost surely, 2^1855920913 is an apocalyptic number.

It is an amenable number.

1855920913 is a deficient number, since it is larger than the sum of its proper divisors (590851055).

1855920913 is a wasteful number, since it uses less digits than its factorization.

1855920913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334 (or 1327 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 1855920913 is about 43080.4005668471. The cubic root of 1855920913 is about 1228.9092745436.

The spelling of 1855920913 in words is "one billion, eight hundred fifty-five million, nine hundred twenty thousand, nine hundred thirteen".