381406645 has 16 divisors (see below), whose sum is σ = 494926848. Its totient is φ = 281063680.

The previous prime is 381406607. The next prime is 381406657. The reversal of 381406645 is 546604183.

It is a happy number.

It is not a de Polignac number, because 381406645 - 2²⁵ = 347852213 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 43741 + ... + 51730.

It is an arithmetic number, because the mean of its divisors is an integer number (30932928).

Almost surely, 2^381406645 is an apocalyptic number.

It is an amenable number.

381406645 is a deficient number, since it is larger than the sum of its proper divisors (113520203).

381406645 is a wasteful number, since it uses less digits than its factorization.

381406645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95540.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 381406645 is about 19529.6350452332. The cubic root of 381406645 is about 725.2082762690.

The spelling of 381406645 in words is "three hundred eighty-one million, four hundred six thousand, six hundred forty-five".