308442421 has 4 divisors (see below), whose sum is σ = 352505632. Its totient is φ = 264379212.

The previous prime is 308442403. The next prime is 308442451. The reversal of 308442421 is 124244803.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 308442421 - 2¹³ = 308434229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 308442421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308442451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22031595 + ... + 22031608.

It is an arithmetic number, because the mean of its divisors is an integer number (88126408).

Almost surely, 2^308442421 is an apocalyptic number.

It is an amenable number.

308442421 is a deficient number, since it is larger than the sum of its proper divisors (44063211).

308442421 is an equidigital number, since it uses as much as digits as its factorization.

308442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44063210.

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 308442421 is about 17562.5288896560. The cubic root of 308442421 is about 675.6545427756.

The spelling of 308442421 in words is "three hundred eight million, four hundred forty-two thousand, four hundred twenty-one".