381212138 has 4 divisors (see below), whose sum is σ = 571818210. Its totient is φ = 190606068.

The previous prime is 381212123. The next prime is 381212141. The reversal of 381212138 is 831212183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 269846329 + 111365809 = 16427^2 + 10553^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 381212138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95303033 + ... + 95303036.

Almost surely, 2^381212138 is an apocalyptic number.

381212138 is a deficient number, since it is larger than the sum of its proper divisors (190606072).

381212138 is a wasteful number, since it uses less digits than its factorization.

381212138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190606071.

The product of its digits is 2304, while the sum is 29.

The square root of 381212138 is about 19524.6546192244. The cubic root of 381212138 is about 725.0849764843.

The spelling of 381212138 in words is "three hundred eighty-one million, two hundred twelve thousand, one hundred thirty-eight".