7855381 has 2 divisors, whose sum is σ = 7855382. Its totient is φ = 7855380.

The previous prime is 7855357. The next prime is 7855399. The reversal of 7855381 is 1835587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7535025 + 320356 = 2745^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 7855381 - 2⁵ = 7855349 is a prime.

It is a super-2 number, since 2×7855381² = 123414021310322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7855381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7855301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3927690 + 3927691.

It is an arithmetic number, because the mean of its divisors is an integer number (3927691).

Almost surely, 2^7855381 is an apocalyptic number.

It is an amenable number.

7855381 is a deficient number, since it is larger than the sum of its proper divisors (1).

7855381 is an equidigital number, since it uses as much as digits as its factorization.

7855381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 37.

The square root of 7855381 is about 2802.7452613465. The cubic root of 7855381 is about 198.7875058104.

The spelling of 7855381 in words is "seven million, eight hundred fifty-five thousand, three hundred eighty-one".