1855804538 has 12 divisors (see below), whose sum is σ = 3238189722. Its totient is φ = 795344760.

The previous prime is 1855804481. The next prime is 1855804583. The reversal of 1855804538 is 8354085581.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1344908929 + 510895609 = 36673^2 + 22603^2 .

It is a super-2 number, since 2×1855804538² = 6888020966522786888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1855804492 and 1855804501.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9468293 + ... + 9468488.

Almost surely, 2^1855804538 is an apocalyptic number.

1855804538 is a deficient number, since it is larger than the sum of its proper divisors (1382385184).

1855804538 is a wasteful number, since it uses less digits than its factorization.

1855804538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18936797 (or 18936790 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 47.

The square root of 1855804538 is about 43079.0498734594. The cubic root of 1855804538 is about 1228.8835878696.

The spelling of 1855804538 in words is "one billion, eight hundred fifty-five million, eight hundred four thousand, five hundred thirty-eight".