381554775 has 36 divisors (see below), whose sum is σ = 781039792. Its totient is φ = 174424320.

The previous prime is 381554773. The next prime is 381554809. The reversal of 381554775 is 577455183.

It is a happy number.

381554775 is a `hidden beast` number, since 38 + 1 + 5 + 547 + 75 = 666.

It is not a de Polignac number, because 381554775 - 2¹ = 381554773 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 381554775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381554773) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 119554 + ... + 122703.

Almost surely, 2^381554775 is an apocalyptic number.

381554775 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

381554775 is an abundant number, since it is smaller than the sum of its proper divisors (399485017).

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

381554775 is a wasteful number, since it uses less digits than its factorization.

381554775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242280 (or 242272 counting only the distinct ones).

The product of its digits is 588000, while the sum is 45.

The square root of 381554775 is about 19533.4271186600. The cubic root of 381554775 is about 725.3021491290.

The spelling of 381554775 in words is "three hundred eighty-one million, five hundred fifty-four thousand, seven hundred seventy-five".