381432857 has 4 divisors (see below), whose sum is σ = 410773860. Its totient is φ = 352091856.

The previous prime is 381432829. The next prime is 381432899. The reversal of 381432857 is 758234183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21799561 + 359633296 = 4669^2 + 18964^2 .

It is a cyclic number.

It is not a de Polignac number, because 381432857 - 2¹⁰ = 381431833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381434857) 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, 14670482 + ... + 14670507.

It is an arithmetic number, because the mean of its divisors is an integer number (102693465).

Almost surely, 2^381432857 is an apocalyptic number.

It is an amenable number.

381432857 is a deficient number, since it is larger than the sum of its proper divisors (29341003).

381432857 is a wasteful number, since it uses less digits than its factorization.

381432857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29341002.

The product of its digits is 161280, while the sum is 41.

The square root of 381432857 is about 19530.3061163925. The cubic root of 381432857 is about 725.2248890925.

The spelling of 381432857 in words is "three hundred eighty-one million, four hundred thirty-two thousand, eight hundred fifty-seven".