145240421 has 8 divisors (see below), whose sum is σ = 146577600. Its totient is φ = 143909440.

The previous prime is 145240379. The next prime is 145240441. The reversal of 145240421 is 124042541.

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 145240421 - 2⁶ = 145240357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145240441) 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 7 ways as a sum of consecutive naturals, for example, 54365 + ... + 56973.

It is an arithmetic number, because the mean of its divisors is an integer number (18322200).

Almost surely, 2^145240421 is an apocalyptic number.

It is an amenable number.

145240421 is a deficient number, since it is larger than the sum of its proper divisors (1337179).

145240421 is a wasteful number, since it uses less digits than its factorization.

145240421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3099.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 145240421 is about 12051.5733827580. The cubic root of 145240421 is about 525.6489884911.

Adding to 145240421 its reverse (124042541), we get a palindrome (269282962).

The spelling of 145240421 in words is "one hundred forty-five million, two hundred forty thousand, four hundred twenty-one".