1868236641 has 24 divisors (see below), whose sum is σ = 2859821640. Its totient is φ = 1171193856.

The previous prime is 1868236633. The next prime is 1868236679. The reversal of 1868236641 is 1466328681.

It can be written as a sum of positive squares in 4 ways, for example, as 1354534416 + 513702225 = 36804^2 + 22665^2 .

It is not a de Polignac number, because 1868236641 - 2³ = 1868236633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1868236681) 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 23 ways as a sum of consecutive naturals, for example, 192481 + ... + 201953.

It is an arithmetic number, because the mean of its divisors is an integer number (119159235).

Almost surely, 2^1868236641 is an apocalyptic number.

It is an amenable number.

1868236641 is a deficient number, since it is larger than the sum of its proper divisors (991584999).

1868236641 is a wasteful number, since it uses less digits than its factorization.

1868236641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10785 (or 10782 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 1868236641 is about 43223.1030931376. The cubic root of 1868236641 is about 1231.6215950868.

The spelling of 1868236641 in words is "one billion, eight hundred sixty-eight million, two hundred thirty-six thousand, six hundred forty-one".