145900421 has 6 divisors (see below), whose sum is σ = 150998790. Its totient is φ = 140806568.

The previous prime is 145900399. The next prime is 145900423. The reversal of 145900421 is 124009541.

It can be written as a sum of positive squares in only one way, i.e., 125776225 + 20124196 = 11215^2 + 4486^2 .

It is a de Polignac number, because none of the positive numbers 2^k-145900421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145900423) 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 5 ways as a sum of consecutive naturals, for example, 63926 + ... + 66168.

It is an arithmetic number, because the mean of its divisors is an integer number (25166465).

Almost surely, 2^145900421 is an apocalyptic number.

It is an amenable number.

145900421 is a deficient number, since it is larger than the sum of its proper divisors (5098369).

145900421 is an frugal number, since it uses more digits than its factorization.

145900421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4515 (or 2272 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 145900421 is about 12078.9246624027. The cubic root of 145900421 is about 526.4440016837. Note that the first 3 decimals are identical.

Adding to 145900421 its reverse (124009541), we get a palindrome (269909962).

The spelling of 145900421 in words is "one hundred forty-five million, nine hundred thousand, four hundred twenty-one".