7820381 has 8 divisors (see below), whose sum is σ = 8433600. Its totient is φ = 7227360.

The previous prime is 7820369. The next prime is 7820389. The reversal of 7820381 is 1830287.

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

It is a cyclic number.

It is not a de Polignac number, because 7820381 - 2⁶ = 7820317 is a prime.

It is a super-2 number, since 2×7820381² = 122316717970322, 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 (7820389) 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, 4241 + ... + 5798.

It is an arithmetic number, because the mean of its divisors is an integer number (1054200).

Almost surely, 2^7820381 is an apocalyptic number.

It is an amenable number.

7820381 is a deficient number, since it is larger than the sum of its proper divisors (613219).

7820381 is a wasteful number, since it uses less digits than its factorization.

7820381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10099.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 7820381 is about 2796.4944126531. The cubic root of 7820381 is about 198.4918307141.

The spelling of 7820381 in words is "seven million, eight hundred twenty thousand, three hundred eighty-one".