244638421 has 2 divisors, whose sum is σ = 244638422. Its totient is φ = 244638420.

The previous prime is 244638397. The next prime is 244638437. The reversal of 244638421 is 124836442.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193515921 + 51122500 = 13911^2 + 7150^2 .

It is a cyclic number.

It is not a de Polignac number, because 244638421 - 2¹⁷ = 244507349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (244638221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122319210 + 122319211.

It is an arithmetic number, because the mean of its divisors is an integer number (122319211).

Almost surely, 2^244638421 is an apocalyptic number.

It is an amenable number.

244638421 is a deficient number, since it is larger than the sum of its proper divisors (1).

244638421 is an equidigital number, since it uses as much as digits as its factorization.

244638421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 34.

The square root of 244638421 is about 15640.9213603291. The cubic root of 244638421 is about 625.4244975377.

The spelling of 244638421 in words is "two hundred forty-four million, six hundred thirty-eight thousand, four hundred twenty-one".