1868836490 has 16 divisors (see below), whose sum is σ = 3367071720. Its totient is φ = 746831040.

The previous prime is 1868836483. The next prime is 1868836499. The reversal of 1868836490 is 946388681.

It can be written as a sum of positive squares in 4 ways, for example, as 831803281 + 1037033209 = 28841^2 + 32203^2 .

It is not an unprimeable number, because it can be changed into a prime (1868836499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76721 + ... + 98100.

Almost surely, 2^1868836490 is an apocalyptic number.

1868836490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1868836490 is a deficient number, since it is larger than the sum of its proper divisors (1498235230).

1868836490 is a wasteful number, since it uses less digits than its factorization.

1868836490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175897.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The square root of 1868836490 is about 43230.0415220712. The cubic root of 1868836490 is about 1231.7533963641.

The spelling of 1868836490 in words is "one billion, eight hundred sixty-eight million, eight hundred thirty-six thousand, four hundred ninety".