189815808 has 264 divisors, whose sum is σ = 640334352. Its totient is φ = 49545216.

The previous prime is 189815797. The next prime is 189815819. The reversal of 189815808 is 808518981.

It is an interprime number because it is at equal distance from previous prime (189815797) and next prime (189815819).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1956816 + ... + 1956912.

Almost surely, 2^189815808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189815808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320167176).

189815808 is an abundant number, since it is smaller than the sum of its proper divisors (450518544).

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

189815808 is a wasteful number, since it uses less digits than its factorization.

189815808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 48.

The square root of 189815808 is about 13777.3657859549. The cubic root of 189815808 is about 574.7038757519.

The spelling of 189815808 in words is "one hundred eighty-nine million, eight hundred fifteen thousand, eight hundred eight".