308641421 has 4 divisors (see below), whose sum is σ = 336699744. Its totient is φ = 280583100.

The previous prime is 308641379. The next prime is 308641423. The reversal of 308641421 is 124146803.

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 a de Polignac number, because none of the positive numbers 2^k-308641421 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 (308641423) 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, 14029145 + ... + 14029166.

It is an arithmetic number, because the mean of its divisors is an integer number (84174936).

Almost surely, 2^308641421 is an apocalyptic number.

It is an amenable number.

308641421 is a deficient number, since it is larger than the sum of its proper divisors (28058323).

308641421 is a wasteful number, since it uses less digits than its factorization.

308641421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28058322.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 308641421 is about 17568.1934472501. The cubic root of 308641421 is about 675.7998171601.

The spelling of 308641421 in words is "three hundred eight million, six hundred forty-one thousand, four hundred twenty-one".