381633518 has 16 divisors (see below), whose sum is σ = 655139040. Its totient is φ = 163329696.

The previous prime is 381633509. The next prime is 381633547. The reversal of 381633518 is 815336183.

It is a super-2 number, since 2×381633518² = 291288284122112648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8333 + ... + 28856.

It is an arithmetic number, because the mean of its divisors is an integer number (40946190).

Almost surely, 2^381633518 is an apocalyptic number.

381633518 is a deficient number, since it is larger than the sum of its proper divisors (273505522).

381633518 is a wasteful number, since it uses less digits than its factorization.

381633518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37931.

The product of its digits is 51840, while the sum is 38.

The square root of 381633518 is about 19535.4426108036. The cubic root of 381633518 is about 725.3520402084.

The spelling of 381633518 in words is "three hundred eighty-one million, six hundred thirty-three thousand, five hundred eighteen".