308090421 has 6 divisors (see below), whose sum is σ = 445019510. Its totient is φ = 205393608.

The previous prime is 308090413. The next prime is 308090423. The reversal of 308090421 is 124090803.

It can be written as a sum of positive squares in only one way, i.e., 298909521 + 9180900 = 17289^2 + 3030^2 .

It is not a de Polignac number, because 308090421 - 2³ = 308090413 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 (308090423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17116126 + ... + 17116143.

Almost surely, 2^308090421 is an apocalyptic number.

It is an amenable number.

308090421 is a deficient number, since it is larger than the sum of its proper divisors (136929089).

308090421 is a wasteful number, since it uses less digits than its factorization.

308090421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34232275 (or 34232272 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 308090421 is about 17552.5046930630. The cubic root of 308090421 is about 675.3974219298.

The spelling of 308090421 in words is "three hundred eight million, ninety thousand, four hundred twenty-one".