381215243 has 4 divisors (see below), whose sum is σ = 381256968. Its totient is φ = 381173520.

The previous prime is 381215239. The next prime is 381215249. The reversal of 381215243 is 342512183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 381215243 - 2² = 381215239 is a prime.

It is a super-2 number, since 2×381215243² = 290650122991098098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381215249) 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, 593 + ... + 27618.

It is an arithmetic number, because the mean of its divisors is an integer number (95314242).

Almost surely, 2^381215243 is an apocalyptic number.

381215243 is a deficient number, since it is larger than the sum of its proper divisors (41725).

381215243 is a wasteful number, since it uses less digits than its factorization.

381215243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41724.

The product of its digits is 5760, while the sum is 29.

The square root of 381215243 is about 19524.7341339133. The cubic root of 381215243 is about 725.0869451019.

The spelling of 381215243 in words is "three hundred eighty-one million, two hundred fifteen thousand, two hundred forty-three".