145199808 has 84 divisors (see below), whose sum is σ = 448226688. Its totient is φ = 44674560.

The previous prime is 145199783. The next prime is 145199809. The reversal of 145199808 is 808991541.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (145199809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2208 + ... + 17183.

It is an arithmetic number, because the mean of its divisors is an integer number (5336032).

Almost surely, 2^145199808 is an apocalyptic number.

145199808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 145199808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224113344).

145199808 is an abundant number, since it is smaller than the sum of its proper divisors (303026880).

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

145199808 is a wasteful number, since it uses less digits than its factorization.

145199808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19422 (or 19409 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 145199808 is about 12049.8882982375. Note that the first 3 decimals coincide. The cubic root of 145199808 is about 525.5999888799.

The spelling of 145199808 in words is "one hundred forty-five million, one hundred ninety-nine thousand, eight hundred eight".