381407509 has 4 divisors (see below), whose sum is σ = 435894304. Its totient is φ = 326920716.

The previous prime is 381407503. The next prime is 381407561. The reversal of 381407509 is 905704183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 381407509 - 2¹¹ = 381405461 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 (381407503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27243387 + ... + 27243400.

It is an arithmetic number, because the mean of its divisors is an integer number (108973576).

Almost surely, 2^381407509 is an apocalyptic number.

It is an amenable number.

381407509 is a deficient number, since it is larger than the sum of its proper divisors (54486795).

381407509 is an equidigital number, since it uses as much as digits as its factorization.

381407509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54486794.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 381407509 is about 19529.6571654497. The cubic root of 381407509 is about 725.2088238730.

The spelling of 381407509 in words is "three hundred eighty-one million, four hundred seven thousand, five hundred nine".