145223440 has 40 divisors (see below), whose sum is σ = 341728128. Its totient is φ = 57386880.

The previous prime is 145223417. The next prime is 145223443. The reversal of 145223440 is 44322541.

It is a happy number.

145223440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (145223443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4296 + ... + 17575.

Almost surely, 2^145223440 is an apocalyptic number.

145223440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145223440 is an abundant number, since it is smaller than the sum of its proper divisors (196504688).

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

145223440 is a wasteful number, since it uses less digits than its factorization.

145223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21967 (or 21961 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 145223440 is about 12050.8688483445. The cubic root of 145223440 is about 525.6285020148.

Adding to 145223440 its reverse (44322541), we get a palindrome (189545981).

The spelling of 145223440 in words is "one hundred forty-five million, two hundred twenty-three thousand, four hundred forty".