1308638421 has 12 divisors (see below), whose sum is σ = 1890901740. Its totient is φ = 872127360.

The previous prime is 1308638399. The next prime is 1308638453. The reversal of 1308638421 is 1248368031.

1308638421 is a `hidden beast` number, since 13 + 0 + 8 + 638 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23415921 + 1285222500 = 4839^2 + 35850^2 .

It is not a de Polignac number, because 1308638421 - 2⁵ = 1308638389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1308638321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4795 + ... + 51383.

It is an arithmetic number, because the mean of its divisors is an integer number (157575145).

Almost surely, 2^1308638421 is an apocalyptic number.

It is an amenable number.

1308638421 is a deficient number, since it is larger than the sum of its proper divisors (582263319).

1308638421 is a wasteful number, since it uses less digits than its factorization.

1308638421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49716 (or 49713 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1308638421 is about 36175.1077538133. The cubic root of 1308638421 is about 1093.8049613481.

The spelling of 1308638421 in words is "one billion, three hundred eight million, six hundred thirty-eight thousand, four hundred twenty-one".