7866381 has 8 divisors (see below), whose sum is σ = 10504480. Its totient is φ = 5236272.

The previous prime is 7866349. The next prime is 7866389. The reversal of 7866381 is 1836687.

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

It is not a de Polignac number, because 7866381 - 2⁵ = 7866349 is a prime.

It is a super-2 number, since 2×7866381² = 123759900074322, which contains 22 as substring.

It is a Duffinian number.

7866381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7866389) 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, 906 + ... + 4068.

It is an arithmetic number, because the mean of its divisors is an integer number (1313060).

Almost surely, 2^7866381 is an apocalyptic number.

It is an amenable number.

7866381 is a deficient number, since it is larger than the sum of its proper divisors (2638099).

7866381 is a wasteful number, since it uses less digits than its factorization.

7866381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3995.

The product of its digits is 48384, while the sum is 39.

The square root of 7866381 is about 2804.7069365622. The cubic root of 7866381 is about 198.8802508423.

The spelling of 7866381 in words is "seven million, eight hundred sixty-six thousand, three hundred eighty-one".