638126145 has 24 divisors (see below), whose sum is σ = 1154177856. Its totient is φ = 325536288.

The previous prime is 638126141. The next prime is 638126183. The reversal of 638126145 is 541621836.

It is a happy number.

638126145 is a `hidden beast` number, since 6 + 38 + 1 + 2 + 614 + 5 = 666.

It is not a de Polignac number, because 638126145 - 2² = 638126141 is a prime.

It is a super-2 number, since 2×638126145² = 814409953865122050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638126141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307239 + ... + 309308.

It is an arithmetic number, because the mean of its divisors is an integer number (48090744).

Almost surely, 2^638126145 is an apocalyptic number.

It is an amenable number.

638126145 is a deficient number, since it is larger than the sum of its proper divisors (516051711).

638126145 is a wasteful number, since it uses less digits than its factorization.

638126145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616581 (or 616578 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 638126145 is about 25261.1588214001. The cubic root of 638126145 is about 860.9319916984.

The spelling of 638126145 in words is "six hundred thirty-eight million, one hundred twenty-six thousand, one hundred forty-five".