146404221 has 12 divisors (see below), whose sum is σ = 207364992. Its totient is φ = 91860928.

The previous prime is 146404213. The next prime is 146404259. The reversal of 146404221 is 122404641.

It is a happy number.

It is not a de Polignac number, because 146404221 - 2³ = 146404213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 146404191 and 146404200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146403221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83565 + ... + 85298.

It is an arithmetic number, because the mean of its divisors is an integer number (17280416).

Almost surely, 2^146404221 is an apocalyptic number.

It is an amenable number.

146404221 is a deficient number, since it is larger than the sum of its proper divisors (60960771).

146404221 is a wasteful number, since it uses less digits than its factorization.

146404221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168900 (or 168883 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 146404221 is about 12099.7611959906. The cubic root of 146404221 is about 527.0492496464.

Adding to 146404221 its reverse (122404641), we get a palindrome (268808862).

The spelling of 146404221 in words is "one hundred forty-six million, four hundred four thousand, two hundred twenty-one".