381666726 has 24 divisors (see below), whose sum is σ = 945079824. Its totient is φ = 109047600.

The previous prime is 381666713. The next prime is 381666731. The reversal of 381666726 is 627666183.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1514425 + ... + 1514676.

It is an arithmetic number, because the mean of its divisors is an integer number (39378326).

Almost surely, 2^381666726 is an apocalyptic number.

381666726 is an abundant number, since it is smaller than the sum of its proper divisors (563413098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381666726 is a wasteful number, since it uses less digits than its factorization.

381666726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3029116 (or 3029113 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 381666726 is about 19536.2925346648. The cubic root of 381666726 is about 725.3730785351.

The spelling of 381666726 in words is "three hundred eighty-one million, six hundred sixty-six thousand, seven hundred twenty-six".