2857381 has 2 divisors, whose sum is σ = 2857382. Its totient is φ = 2857380.

The previous prime is 2857369. The next prime is 2857397. The reversal of 2857381 is 1837582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2056356 + 801025 = 1434^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 2857381 - 2²¹ = 760229 is a prime.

It is a super-2 number, since 2×2857381² = 16329252358322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2857321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428690 + 1428691.

It is an arithmetic number, because the mean of its divisors is an integer number (1428691).

2^2857381 is an apocalyptic number.

It is an amenable number.

2857381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2857381 is an equidigital number, since it uses as much as digits as its factorization.

2857381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 2857381 is about 1690.3789515964. The cubic root of 2857381 is about 141.9022834964.

The spelling of 2857381 in words is "two million, eight hundred fifty-seven thousand, three hundred eighty-one".