145221804 has 144 divisors (see below), whose sum is σ = 457457728. Its totient is φ = 37822464.

The previous prime is 145221799. The next prime is 145221827. The reversal of 145221804 is 408122541.

145221804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 317544 + ... + 318000.

Almost surely, 2^145221804 is an apocalyptic number.

145221804 is a gapful number since it is divisible by the number (14) 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 145221804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228728864).

145221804 is an abundant number, since it is smaller than the sum of its proper divisors (312235924).

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

145221804 is a wasteful number, since it uses less digits than its factorization.

145221804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 579 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 145221804 is about 12050.8009692302. The cubic root of 145221804 is about 525.6265282024.

The spelling of 145221804 in words is "one hundred forty-five million, two hundred twenty-one thousand, eight hundred four".