404148421 has 2 divisors, whose sum is σ = 404148422. Its totient is φ = 404148420.

The previous prime is 404148419. The next prime is 404148461. The reversal of 404148421 is 124841404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393585921 + 10562500 = 19839^2 + 3250^2 .

It is a cyclic number.

It is not a de Polignac number, because 404148421 - 2¹ = 404148419 is a prime.

Together with 404148419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 404148421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404148461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202074210 + 202074211.

It is an arithmetic number, because the mean of its divisors is an integer number (202074211).

Almost surely, 2^404148421 is an apocalyptic number.

It is an amenable number.

404148421 is a deficient number, since it is larger than the sum of its proper divisors (1).

404148421 is an equidigital number, since it uses as much as digits as its factorization.

404148421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 404148421 is about 20103.4430135736. The cubic root of 404148421 is about 739.3446968371.

Adding to 404148421 its reverse (124841404), we get a palindrome (528989825).

The spelling of 404148421 in words is "four hundred four million, one hundred forty-eight thousand, four hundred twenty-one".