381187018 has 4 divisors (see below), whose sum is σ = 571780530. Its totient is φ = 190593508.

The previous prime is 381187007. The next prime is 381187021. The reversal of 381187018 is 810781183.

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., 318729609 + 62457409 = 17853^2 + 7903^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95296753 + ... + 95296756.

Almost surely, 2^381187018 is an apocalyptic number.

381187018 is a deficient number, since it is larger than the sum of its proper divisors (190593512).

381187018 is a wasteful number, since it uses less digits than its factorization.

381187018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190593511.

The product of its (nonzero) digits is 10752, while the sum is 37.

The square root of 381187018 is about 19524.0113193985. The cubic root of 381187018 is about 725.0690496264.

The spelling of 381187018 in words is "three hundred eighty-one million, one hundred eighty-seven thousand, eighteen".