638373413 has 2 divisors, whose sum is σ = 638373414. Its totient is φ = 638373412.

The previous prime is 638373401. The next prime is 638373427. The reversal of 638373413 is 314373836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398681089 + 239692324 = 19967^2 + 15482^2 .

It is a cyclic number.

It is not a de Polignac number, because 638373413 - 2⁴ = 638373397 is a prime.

It is a super-2 number, since 2×638373413² = 815041228850537138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638373473) 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 as a sum of consecutive naturals, namely, 319186706 + 319186707.

It is an arithmetic number, because the mean of its divisors is an integer number (319186707).

Almost surely, 2^638373413 is an apocalyptic number.

It is an amenable number.

638373413 is a deficient number, since it is larger than the sum of its proper divisors (1).

638373413 is an equidigital number, since it uses as much as digits as its factorization.

638373413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 38.

The square root of 638373413 is about 25266.0525804883. The cubic root of 638373413 is about 861.0431784091.

The spelling of 638373413 in words is "six hundred thirty-eight million, three hundred seventy-three thousand, four hundred thirteen".