145421447 has 8 divisors (see below), whose sum is σ = 146617440. Its totient is φ = 144230400.

The previous prime is 145421413. The next prime is 145421473. The reversal of 145421447 is 744124541.

145421447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145421447 - 2¹⁰ = 145420423 is a prime.

It is a super-2 number, since 2×145421447² = 42294794495147618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145421147) 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, 76454 + ... + 78332.

It is an arithmetic number, because the mean of its divisors is an integer number (18327180).

Almost surely, 2^145421447 is an apocalyptic number.

145421447 is a deficient number, since it is larger than the sum of its proper divisors (1195993).

145421447 is a wasteful number, since it uses less digits than its factorization.

145421447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473.

The product of its digits is 17920, while the sum is 32.

The square root of 145421447 is about 12059.0815156047. The cubic root of 145421447 is about 525.8672854516.

Adding to 145421447 its reverse (744124541), we get a palindrome (889545988).

The spelling of 145421447 in words is "one hundred forty-five million, four hundred twenty-one thousand, four hundred forty-seven".