145421844 has 12 divisors (see below), whose sum is σ = 339317664. Its totient is φ = 48473944.

The previous prime is 145421831. The next prime is 145421849. The reversal of 145421844 is 448124541.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×145421844² = 42295025424720672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145421849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6059232 + ... + 6059255.

It is an arithmetic number, because the mean of its divisors is an integer number (28276472).

Almost surely, 2^145421844 is an apocalyptic number.

It is an amenable number.

145421844 is an abundant number, since it is smaller than the sum of its proper divisors (193895820).

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

145421844 is a wasteful number, since it uses less digits than its factorization.

145421844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12118494 (or 12118492 counting only the distinct ones).

The product of its digits is 20480, while the sum is 33.

The square root of 145421844 is about 12059.0979762170. The cubic root of 145421844 is about 525.8677639897.

The spelling of 145421844 in words is "one hundred forty-five million, four hundred twenty-one thousand, eight hundred forty-four".