381897527 has 4 divisors (see below), whose sum is σ = 416615496. Its totient is φ = 347179560.

The previous prime is 381897409. The next prime is 381897533. The reversal of 381897527 is 725798183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 725798183 = 11 ⋅65981653.

It is a cyclic number.

It is not a de Polignac number, because 381897527 - 2¹⁰ = 381896503 is a prime.

It is a super-2 number, since 2×381897527² = 291691442257431458, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381897557) 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, 17358968 + ... + 17358989.

It is an arithmetic number, because the mean of its divisors is an integer number (104153874).

Almost surely, 2^381897527 is an apocalyptic number.

381897527 is a deficient number, since it is larger than the sum of its proper divisors (34717969).

381897527 is a wasteful number, since it uses less digits than its factorization.

381897527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34717968.

The product of its digits is 846720, while the sum is 50.

The square root of 381897527 is about 19542.1986224683. The cubic root of 381897527 is about 725.5192646229.

The spelling of 381897527 in words is "three hundred eighty-one million, eight hundred ninety-seven thousand, five hundred twenty-seven".