215867381 has 8 divisors (see below), whose sum is σ = 221045760. Its totient is φ = 210713488.

The previous prime is 215867369. The next prime is 215867413. The reversal of 215867381 is 183768512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215867381 is a prime.

It is a super-2 number, since 2×215867381² = 93197452359598322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215867321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12380 + ... + 24186.

It is an arithmetic number, because the mean of its divisors is an integer number (27630720).

Almost surely, 2^215867381 is an apocalyptic number.

It is an amenable number.

215867381 is a deficient number, since it is larger than the sum of its proper divisors (5178379).

215867381 is a wasteful number, since it uses less digits than its factorization.

215867381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12243.

The product of its digits is 80640, while the sum is 41.

The square root of 215867381 is about 14692.4259739500. The cubic root of 215867381 is about 599.8771794899.

The spelling of 215867381 in words is "two hundred fifteen million, eight hundred sixty-seven thousand, three hundred eighty-one".