381197218 has 8 divisors (see below), whose sum is σ = 572406300. Its totient is φ = 190395120.

The previous prime is 381197207. The next prime is 381197221. The reversal of 381197218 is 812791183.

It can be written as a sum of positive squares in 2 ways, for example, as 312688489 + 68508729 = 17683^2 + 8277^2 .

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

It is a super-2 number, since 2×381197218² = 290622638021879048, which contains 22 as substring.

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, 99393 + ... + 103156.

Almost surely, 2^381197218 is an apocalyptic number.

381197218 is a deficient number, since it is larger than the sum of its proper divisors (191209082).

381197218 is a wasteful number, since it uses less digits than its factorization.

381197218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203492.

The product of its digits is 24192, while the sum is 40.

The square root of 381197218 is about 19524.2725344634. The cubic root of 381197218 is about 725.0755168266.

The spelling of 381197218 in words is "three hundred eighty-one million, one hundred ninety-seven thousand, two hundred eighteen".