1808969388 has 48 divisors (see below), whose sum is σ = 4513519584. Its totient is φ = 561894400.

The previous prime is 1808969387. The next prime is 1808969399. The reversal of 1808969388 is 8839698081.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1808969387) 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, 23295 + ... + 64502.

It is an arithmetic number, because the mean of its divisors is an integer number (94031658).

Almost surely, 2^1808969388 is an apocalyptic number.

It is an amenable number.

1808969388 is an abundant number, since it is smaller than the sum of its proper divisors (2704550196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1808969388 is a wasteful number, since it uses less digits than its factorization.

1808969388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87922 (or 87920 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 60.

The square root of 1808969388 is about 42531.9807674178. The cubic root of 1808969388 is about 1218.4575571203.

The spelling of 1808969388 in words is "one billion, eight hundred eight million, nine hundred sixty-nine thousand, three hundred eighty-eight".