381735909 has 10 divisors (see below), whose sum is σ = 570247590. Its totient is φ = 254490552.

The previous prime is 381735889. The next prime is 381735941. The reversal of 381735909 is 909537183.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 380367009 + 1368900 = 19503^2 + 1170^2 .

It is not a de Polignac number, because 381735909 - 2⁵ = 381735877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381735989) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2356314 + ... + 2356475.

It is an arithmetic number, because the mean of its divisors is an integer number (57024759).

Almost surely, 2^381735909 is an apocalyptic number.

It is an amenable number.

381735909 is a deficient number, since it is larger than the sum of its proper divisors (188511681).

381735909 is an equidigital number, since it uses as much as digits as its factorization.

381735909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712801 (or 4712792 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 381735909 is about 19538.0630820970. The cubic root of 381735909 is about 725.4169042522.

The spelling of 381735909 in words is "three hundred eighty-one million, seven hundred thirty-five thousand, nine hundred nine".