1820619868 has 12 divisors (see below), whose sum is σ = 3198483792. Its totient is φ = 906767360.

The previous prime is 1820619841. The next prime is 1820619893. The reversal of 1820619868 is 8689160281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884488 + ... + 886543.

It is an arithmetic number, because the mean of its divisors is an integer number (266540316).

Almost surely, 2^1820619868 is an apocalyptic number.

It is an amenable number.

1820619868 is a deficient number, since it is larger than the sum of its proper divisors (1377863924).

1820619868 is a wasteful number, since it uses less digits than its factorization.

1820619868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771292 (or 1771290 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 1820619868 is about 42668.7223619363. The cubic root of 1820619868 is about 1221.0677448028.

The spelling of 1820619868 in words is "one billion, eight hundred twenty million, six hundred nineteen thousand, eight hundred sixty-eight".