381639109 has 8 divisors (see below), whose sum is σ = 399348992. Its totient is φ = 364266720.

The previous prime is 381639067. The next prime is 381639143. The reversal of 381639109 is 901936183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 381639109 - 2⁷ = 381638981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381649109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82059 + ... + 86584.

It is an arithmetic number, because the mean of its divisors is an integer number (49918624).

Almost surely, 2^381639109 is an apocalyptic number.

It is an amenable number.

381639109 is a deficient number, since it is larger than the sum of its proper divisors (17709883).

381639109 is a wasteful number, since it uses less digits than its factorization.

381639109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168747.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 381639109 is about 19535.5857091616. The cubic root of 381639109 is about 725.3555823706.

The spelling of 381639109 in words is "three hundred eighty-one million, six hundred thirty-nine thousand, one hundred nine".