1538222138 has 8 divisors (see below), whose sum is σ = 2307501300. Its totient is φ = 769055040.

The previous prime is 1538222117. The next prime is 1538222173. The reversal of 1538222138 is 8312228351.

It can be written as a sum of positive squares in 2 ways, for example, as 1425289009 + 112933129 = 37753^2 + 10627^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1538222138² = 4732254691666582088, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1538222098 and 1538222107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32108 + ... + 64088.

Almost surely, 2^1538222138 is an apocalyptic number.

1538222138 is a deficient number, since it is larger than the sum of its proper divisors (769279162).

1538222138 is a wasteful number, since it uses less digits than its factorization.

1538222138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56032.

The product of its digits is 23040, while the sum is 35.

The square root of 1538222138 is about 39220.1751398435. The cubic root of 1538222138 is about 1154.3557905017.

The spelling of 1538222138 in words is "one billion, five hundred thirty-eight million, two hundred twenty-two thousand, one hundred thirty-eight".