1868427621 has 16 divisors (see below), whose sum is σ = 2813421120. Its totient is φ = 1225197360.

The previous prime is 1868427607. The next prime is 1868427679. The reversal of 1868427621 is 1267248681.

1868427621 is a `hidden beast` number, since 18 + 6 + 8 + 4 + 2 + 7 + 621 = 666.

It is not a de Polignac number, because 1868427621 - 2⁷ = 1868427493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868429621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565575 + ... + 568868.

It is an arithmetic number, because the mean of its divisors is an integer number (175838820).

Almost surely, 2^1868427621 is an apocalyptic number.

It is an amenable number.

1868427621 is a deficient number, since it is larger than the sum of its proper divisors (944993499).

1868427621 is a wasteful number, since it uses less digits than its factorization.

1868427621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134513 (or 1134507 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 1868427621 is about 43225.3122718622. The cubic root of 1868427621 is about 1231.6635610548.

The spelling of 1868427621 in words is "one billion, eight hundred sixty-eight million, four hundred twenty-seven thousand, six hundred twenty-one".