1868806390 has 16 divisors (see below), whose sum is σ = 3669656400. Its totient is φ = 679565920.

The previous prime is 1868806349. The next prime is 1868806391. The reversal of 1868806390 is 936088681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868806391) 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, 8494465 + ... + 8494684.

It is an arithmetic number, because the mean of its divisors is an integer number (229353525).

Almost surely, 2^1868806390 is an apocalyptic number.

1868806390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1868806390 is a deficient number, since it is larger than the sum of its proper divisors (1800850010).

1868806390 is a wasteful number, since it uses less digits than its factorization.

1868806390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16989167.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 1868806390 is about 43229.6933831365. The cubic root of 1868806390 is about 1231.7467833411.

The spelling of 1868806390 in words is "one billion, eight hundred sixty-eight million, eight hundred six thousand, three hundred ninety".