381426981 has 32 divisors (see below), whose sum is σ = 559964160. Its totient is φ = 229521600.

The previous prime is 381426979. The next prime is 381427001. The reversal of 381426981 is 189624183.

It is not a de Polignac number, because 381426981 - 2¹ = 381426979 is a prime.

It is a super-2 number, since 2×381426981² = 290973083669548722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381426901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 384396 + ... + 385386.

It is an arithmetic number, because the mean of its divisors is an integer number (17498880).

Almost surely, 2^381426981 is an apocalyptic number.

It is an amenable number.

381426981 is a deficient number, since it is larger than the sum of its proper divisors (178537179).

381426981 is a wasteful number, since it uses less digits than its factorization.

381426981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217.

The product of its digits is 82944, while the sum is 42.

The square root of 381426981 is about 19530.1556829432. The cubic root of 381426981 is about 725.2211650266.

The spelling of 381426981 in words is "three hundred eighty-one million, four hundred twenty-six thousand, nine hundred eighty-one".